fix(changelog): automate git-chglog installation and update CI triggers for changelog generation

[cuisongliu]

This pull request updates the tagpr.yml GitHub Actions workflow to improve how releases are triggered and managed. The main changes revolve around shifting release automation from manual dispatch to automatic behavior on push events, and enhancing the tagging and release workflow for better reliability and clarity.

Release workflow automation improvements:

• Added a new step to automatically tag and push changes when a push event occurs and a new version is available, streamlining the release process.
• Updated the release trigger logic to use push events instead of manual workflow dispatch, ensuring releases are created automatically after a successful push.
• Modified the commit message for release pull requests to clarify that releases are made using GitHub Actions, improving traceability.

Workflow logic cleanup:

• Removed redundant if conditions for workflow dispatch from the actions/checkout and release steps, simplifying the workflow logic. [1] [2]
• Cleaned up commented-out code for the release workflow trigger, replacing it with an active, automated trigger on push events.

[cuisongliu]

Depend on #5851

[dinoallo]

LGTM