Increase message buffer size as a default and make it customizable

[steveny91]

What does this PR do?

The default buffer size for messages in IBM MQ is 4Kb. This PR increases it to 64Kb and make it configurable.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Prevent mock side_effect exhaustion in truncated-message test

This test configures mock_sub.get.side_effect with only two exceptions, but get_latest_messages() loops until 20 seconds elapse. Because the mocked calls return immediately, the loop performs a third get() call, exhausts the iterable side effect, and raises StopIteration, making the unit test fail nondeterministically instead of validating truncated-message handling.

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[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: c88849a | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.04%. Comparing base (387f552) to head (c88849a).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

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Review from OliviaShoup is dismissed. Related teams and files:

• documentation
  • ibm_ace/assets/configuration/spec.yaml