Remove unused streaming response type from embeddings endpoint (fixes #98)

The embeddings endpoint had a text/event-stream response type defined in
the OpenAPI spec, but the spec itself noted: "Not used for embeddings -
embeddings do not support streaming."

This unused response type caused Speakeasy to generate:
  type CreateEmbeddingsResponse = CreateEmbeddingsResponseBody | string;

Which forces developers to write unnecessary type guards.

After regenerating with Speakeasy, the type will be:
  type CreateEmbeddingsResponse = CreateEmbeddingsResponseBody;

Allowing direct access to response.data[0].embedding without checking
if the response is a string first.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: bledden

.speakeasy/in.openapi.yaml

@@ -6716,11 +6716,6 @@ paths:
                   - object
                   - data
                   - model
-            text/event-stream:
-              schema:
-                type: string
-                description: Not used for embeddings - embeddings do not support streaming
-              x-speakeasy-sse-sentinel: '[DONE]'
         '400':
           description: Bad Request - Invalid request parameters or malformed input
           content: