Update Logback smoke tests to use new assertion framework

[Copilot]

This PR updates the Logback smoke tests to use the new assertion framework introduced in #4141, making the tests more readable and maintainable while keeping changes minimal.

Changes Made

Framework Extensions

• Added MessageAssert class: Provides fluent assertions for MessageData with methods like hasMessage(), hasSeverityLevel(), hasProperty(), etc.
• Added ExceptionAssert class: Provides fluent assertions for ExceptionData with methods like hasExceptionType(), hasExceptionMessage(), hasSeverityLevel(), etc.
• Extended TraceAssert class: Added support for message and exception assertions with hasMessageSatisfying(), hasExceptionSatisfying(), hasMessageCount(), hasExceptionCount() methods.

Test Updates

All Logback smoke tests have been converted from manual envelope parsing to the new fluent assertion API:

• LogbackTest.java: Converted complex manual assertions to clean testing.waitAndAssertTrace() calls
• LogbackDisabledTest.java: Simplified assertions for disabled logging behavior validation
• LogbackLevelOffTest.java: Updated to use new assertion framework for level-off configuration testing

Before/After Comparison

Before (old manual approach):

List<Envelope> rdList = testing.mockedIngestion.waitForItems("RequestData", 1);
Envelope rdEnvelope = rdList.get(0);
String operationId = rdEnvelope.getTags().get("ai.operation.id");
List<Envelope> mdList = testing.mockedIngestion.waitForMessageItemsInRequest(3, operationId);

RequestData rd = (RequestData) ((Data<?>) rdEnvelope.getData()).getBaseData();
List<MessageData> logs = testing.mockedIngestion.getMessageDataInRequest(3);
logs.sort(Comparator.comparing(MessageData::getSeverityLevel));

assertThat(logs.get(0).getMessage()).isEqualTo("This is logback warn.");
assertThat(logs.get(0).getSeverityLevel()).isEqualTo(SeverityLevel.WARNING);
// ... many more manual assertions

After (new fluent API):

testing.waitAndAssertTrace(
    trace ->
        trace
            .hasRequestSatisying(
                request ->
                    request
                        .hasName("GET /Logback/test")
                        .hasSuccess(true)
                        .hasNoSampleRate())
            .hasMessageCount(3)
            .hasMessageSatisfying(
                message ->
                    message
                        .hasMessage("This is logback warn.")
                        .hasSeverityLevel(SeverityLevel.WARNING)
                        .hasProperty("SourceType", "Logger")
                        .hasProperty("LoggerName", "smoketestapp")));

Benefits

• Cleaner Code: Reduced from 186 lines to 140 lines across test files
• Better Readability: Fluent API makes test intentions clearer
• Consistency: Aligned with new assertion framework pattern used in other tests
• Maintainability: Easier to extend and modify assertions in the future

Testing

• ✅ All Logback smoke tests pass (LogbackTest, LogbackDisabledTest, LogbackLevelOffTest)
• ✅ Code formatting verified with ./gradlew spotlessApply
• ✅ Framework extensions compile successfully

The assertion framework extensions (MessageAssert, ExceptionAssert) can be reused by other smoke tests that need to validate message and exception data.

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[trask]

@copilot preserve existing comments where possible

[Copilot]

@copilot preserve existing comments where possible

Added the missing comments back to both LogbackDisabledTest.java and LogbackLevelOffTest.java to preserve the important context about span exception behavior. The comments // check that span exception is still captured and // this is not a logger-based exception are now included in the updated test files. (commit 5067e07)