Fix changelog action not working for Java workflows

[yannick-roeder]

Already started in #186

Notes:

• Use small release notes from output of new changelog action in GitHub release
• Fix push order of changelog and release. Temp fix by @yannick-roeder already applied in these PRs:
  • https://github.com/bakdata/ci-templates/pull/230/files
  • https://github.com/bakdata/ci-templates/pull/229/files
• Use https://github.com/bakdata/kpops-examples for testing