Release notes are not mentioning breaking changes

[jonatan-ivanov]

There were a bunch of breaking changes in opentelemetry-java-instrumentation:1.28.0 (e.g.: #8738) but according to the release notes there were no breaking changes.

Could you add some automation around release notes generation so that people will be aware that there are breaking changes in that release and also can find the migration path (usually in the PR that introduced the breaking change)?

See original thread on Slack: https://cloud-native.slack.com/archives/C014L2KCTE3/p1689965360046879