Fix flaky test ResponsePublisherTimeoutIntegrationTest

[S-Saranya1]

Motivation and Context

defaultTimeout_firstPublisherNotConsumed_secondRequestTimesOut flakes with Expecting code to raise a throwable because the 5-byte content ("Hello") is received as a FullHttpResponse by Netty. In ResponseHandler, the FullHttpResponse path calls finalizeResponse() which releases the connection back to the pool immediately, so the second request acquires it and succeeds instead of timing out.

Modifications

Increased content size to 2MB to force Netty to treat the response as a StreamedHttpResponse, which keeps the connection held until the publisher body is consumed or the timeout fires.

Testing

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

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