sinkV2(ticdc): sink manager close the sink factory at the last (#8219)

[ti-chi-bot]

This is an automated cherry-pick of #8219

What problem does this PR solve?

Issue Number: close #8216

What is changed and how it works?

When close the sink manager, close the sink factory at the last, after make sure all sink workers exited.

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`

[ti-chi-bot]

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[3AceShowHand]

/merge

[ti-chi-bot]

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

Commit hash: ac5df90

[3AceShowHand]

/run-verify-ci

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@bdd1226). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 39a1f2a differs from pull request most recent head ac5df90. Consider uploading reports for the commit ac5df90 to get more accurate results

Additional details and impacted files

Flag	Coverage Δ
cdc	66.5482% <0.0000%> (?)
dm	55.3043% <0.0000%> (?)
engine	66.6056% <0.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

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