changefeed (ticdc): remove status of a changefeed after it is removed (#9174) #9183
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This is an automated cherry-pick of #9174
What problem does this PR solve?
Issue Number: close #9173 #9177
What is changed and how it works?
Delete the status metric of a changefeed when it is removed.
Check List
Tests
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note