fix: Reduce warning/stdout outputs during test executions

[seratch]

This pull request reduces unnecessary stdout outputs during pnpm test execution. Not yet eliminated (mainly agents-realtime has a few more outputs that should be managed properly) but this PR definitely improves it.

Current outputs:

> CI=1 NODE_ENV=test vitest

 RUN  v3.1.1 /path-to/openai-agents-js

 ✓  @openai/agents-realtime  test/utils.test.ts (8 tests) 2ms
 ✓  @openai/agents-core  test/tracing.test.ts (10 tests) 5ms
 ✓  @openai/agents-openai  test/openaiChatCompletionsConverter.test.ts (14 tests) 3ms
 ✓  @openai/agents-core  test/items.test.ts (8 tests) 2ms
 ✓  @openai/agents-core  test/runState.test.ts (14 tests) 6ms
 ✓  @openai/agents-openai  test/openaiChatCompletionsModel.test.ts (8 tests) 6ms
 ✓  @openai/agents-realtime  test/openaiRealtimeWebRtc.test.ts (6 tests) 7ms
 ✓  @openai/agents-openai  test/openaiResponsesModel.helpers.test.ts (14 tests) 4ms
 ✓  @openai/agents-core  test/agent.test.ts (15 tests) 5ms
stdout | test/openaiRealtimeWebsocket.test.ts > OpenAIRealtimeWebSocket > handles audio delta, speech started and created/done events
Interrupting response after 0ms
Audio length: 0.020833333333333332ms
Interrupting response after 0ms
Audio length: 0.020833333333333332ms

 ✓  @openai/agents-core  test/runImplementation.test.ts (31 tests) 8ms
stdout | test/openaiRealtimeWebsocket.test.ts > OpenAIRealtimeWebSocket > full interrupt/_interrupt flow
Interrupting response after 0ms
Audio length: 0.020833333333333332ms

 ✓  @openai/agents-realtime  test/openaiRealtimeWebsocket.test.ts (8 tests) 9ms
stderr | test/realtimeSession.test.ts > RealtimeSession > sets the trace config correctly
In order to set traceMetadata or a groupId you need to specify a workflowName.

 ✓  @openai/agents-core  test/run.test.ts (18 tests) 17ms
stderr | test/realtimeSession.test.ts > RealtimeSession > propagates errors from handleFunctionCall
Error handling function call ModelBehaviorError: Tool missing not found
    at RealtimeSession.#handleFunctionCall (/Users/seratch/code/openai-agents-js/packages/agents-realtime/src/realtimeSession.ts:444:15)
    at EventEmitter.<anonymous> (/Users/seratch/code/openai-agents-js/packages/agents-realtime/src/realtimeSession.ts:589:9) {
  state: undefined
}

 ✓  @openai/agents-extensions  test/aiSdk.test.ts (22 tests) 8ms
 ✓  @openai/agents-realtime  test/realtimeSession.test.ts (11 tests) 109ms
 ✓  @openai/agents-realtime  test/openaiRealtimeEvents.test.ts (5 tests) 3ms
 ✓  @openai/agents-openai  test/openaiChatCompletionsStreaming.test.ts (2 tests) 2ms
 ✓  @openai/agents-openai  test/openaiResponsesModel.test.ts (2 tests) 4ms
stderr | test/openaiTracingExporter.test.ts > OpenAITracingExporter > skips export when no apiKey
No API key provided for OpenAI tracing exporter. Exports will be skipped

stderr | test/openaiTracingExporter.test.ts > OpenAITracingExporter > retries on server errors
[non-fatal] Tracing: server error 500, retrying.

stderr | test/openaiTracingExporter.test.ts > OpenAITracingExporter > stops on client error
[non-fatal] Tracing client error 400: bad

 ✓  @openai/agents-core  test/guardrail.test.ts (5 tests) 3ms
 ✓  @openai/agents-realtime  test/openaiRealtimeBase.test.ts (6 tests) 4ms
stderr | test/TwilioRealtimeTransport.test.ts > TwilioRealtimeTransportLayer > connect handles messages and events
Error parsing message: SyntaxError: Unexpected token 'b', "bad{" is not valid JSON
    at JSON.parse (<anonymous>)
    at FakeTwilioWebSocket.<anonymous> (/Users/seratch/code/openai-agents-js/packages/agents-extensions/src/TwilioRealtimeTransport.ts:87:27)
    at FakeTwilioWebSocket.emit (node:events:518:28)
    at /Users/seratch/code/openai-agents-js/packages/agents-extensions/test/TwilioRealtimeTransport.test.ts:89:12
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at file:///Users/seratch/code/openai-agents-js/node_modules/@vitest/runner/dist/index.js:595:20 Message: { toString: [Function: toString] }

 ✓  @openai/agents-core  test/tool.test.ts (5 tests) 4ms
 ✓  @openai/agents-extensions  test/TwilioRealtimeTransport.test.ts (3 tests) 5ms
 ✓  @openai/agents-core  test/handoffs.test.ts (3 tests) 5ms
 ✓  @openai/agents-core  test/result.test.ts (4 tests) 5ms
stderr | test/handoff.test.ts > handoff() > parses JSON and reports errors
Invalid JSON when parsing: bad. Error: SyntaxError: Unexpected token 'b', "bad" is not valid JSON

 ✓  @openai/agents-core  test/handoff.test.ts (5 tests) 4ms
 ✓  @openai/agents-core  test/shims/mcp-stdio/node.test.ts (1 test) 32ms
 ✓  @openai/agents-openai  test/openaiTracingExporter.test.ts (5 tests) 36ms
 ✓  @openai/agents-extensions  test/index.test.ts (2 tests) 3ms
 ✓  @openai/agents-core  test/utils/messages.test.ts (4 tests) 1ms
 ✓  @openai/agents-core  test/utils/serialize.test.ts (4 tests) 1ms
 ✓  @openai/agents-core  test/utils/tools.test.ts (5 tests) 3ms
 ✓  @openai/agents-core  test/helpers/message.test.ts (4 tests) 2ms
 ✓  @openai/agents-core  test/utils/smartString.test.ts (7 tests) 2ms
 ✓  @openai/agents-core  test/usage.test.ts (3 tests) 2ms
 ✓  @openai/agents-openai  test/tools.test.ts (2 tests) 1ms
 ✓  @openai/agents-core  test/utils/typeGuards.test.ts (2 tests) 1ms
 ✓  @openai/agents-core  test/mcpCache.test.ts (1 test) 3ms
 ✓  @openai/agents-core  test/errors.test.ts (1 test) 2ms
 ✓  @openai/agents-openai  test/defaults.test.ts (5 tests) 2ms
 ✓  @openai/agents-core  test/runContext.test.ts (3 tests) 2ms
 ✓  @openai/agents-core  test/run.stream.test.ts (2 tests) 4ms
 ✓  @openai/agents-openai  test/openaiProvider.test.ts (4 tests) 2ms
 ✓  @openai/agents-core  test/model.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/utils/safeExecute.test.ts (2 tests) 1ms
 ✓  @openai/agents-core  test/run.utils.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/extensions/handoffPrompt.test.ts (2 tests) 1ms
 ✓  @openai/agents-realtime  test/openaiRealtimeWebRtc.environment.test.ts (1 test) 1ms
 ✓  @openai/agents-realtime  test/index.test.ts (2 tests) 1ms
 ✓  @openai/agents-core  test/extensions/handoffFilters.test.ts (1 test) 1ms
 ✓  @openai/agents  test/metadata.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/metadata.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/providers.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/shims/mcp-stdio/browser.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/utils/index.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/index.test.ts (1 test) 1ms
 ✓  @openai/agents-core  test/mcp.test.ts (1 test) 1ms
 ✓  @openai/agents-openai  test/index.test.ts (1 test) 1ms
 ✓  @openai/agents  test/index.test.ts (3 tests) 1ms

 Test Files  57 passed (57)
      Tests  303 passed (303)
   Start at  17:44:23
   Duration  4.33s (transform 1.75s, setup 0ms, collect 8.28s, tests 348ms, environment 5ms, prepare 4.06s)

[dkundel-openai]

Can you generate a changeset for the change in agents core? @seratch

[changeset-bot]

🦋 Changeset detected

Latest commit: 457073c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@openai/agents-core	Patch
@openai/agents-openai	Patch
@openai/agents-realtime	Patch
@openai/agents	Patch
@openai/agents-extensions	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[seratch]

@dkundel-openai

Can you generate a changeset for the change in agents core? @seratch

Added a changeset for this