owner(cdc): clean up metrics when owner resigns (#4998)

[ti-chi-bot]

This is an automated cherry-pick of #4998

What problem does this PR solve?

Issue Number: close #4774

What is changed and how it works?

• Owner must clean up its metrics when it stops.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch

Release note

Fix stale metrics data when TiCDC owner switches.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.