changefeed: Fix cannot remove changefeed when err gcttl exceeded (#2429)

[ti-chi-bot]

This is an automated cherry-pick of #2429

What problem does this PR solve?

fix #2391

What is changed and how it works?

• make changefeed resource can be release before check if meet gcTTL error
• add a GcManager interface, which can be used to create a mocked GcManager to help write unit-test
• fix some typo and lint problems when walking the code.

Check List

Tests

• No code

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

 fix the bug that changefeed cannot be removed if meet GcTTL Exceeded Error

[ti-chi-bot]

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[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 75d0502

[amyangfei]

/run-unit-tests
/run-integration-tests

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-5.1@09b438c). Click here to learn what that means.
The diff coverage is n/a.

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