[chore][receiver/kafkametrics] Added supported versions section

[samiura]

Description: Based on the tests performed on Splunk distribution using Kafkametrics receiver.

Closes #33206

[samiura]

@atoulme Can you please kickstart the changelog CI/CD check? I submitted without [chore] and it is failing.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[crobert-1]

Based on the tests performed on Splunk distribution using Kafkametrics receiver.

Can those tests be moved upstream to this repo instead? That way the tests that show version X is supported are running alongside the documented supported versions.

[samiura]

Based on the tests performed on Splunk distribution using Kafkametrics receiver.

Can those tests be moved upstream to this repo instead? That way the tests that show version X is supported are running alongside the documented supported versions.

Those are manual tests to validate needed for the auto-discovery testing of the Splunk distribution. The reason for this PR since we do not have any supported version(s) mentioned. If the ask is to add integration tests this is beyond this PR.

[crobert-1]

Sorry for the confusion, from the description it looked like the Splunk distro had existing tests to ensure the listed versions are supported. I don't think tests are required at this point to show support, but it would be nice. It doesn't have to block this PR, from my perspective.