dm: reset optimistic sharding group keeper when syncer resume (#9707)

[ti-chi-bot]

This is an automated cherry-pick of #9707

What problem does this PR solve?

Issue Number: close #9588

What is changed and how it works?

• reset optimistic sharding group keeper when syncer resume

Root Cause

when syncer resume, the remain sharding group keeper infos will block replication if we not reset it

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

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

Release note

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	f750bf7	link	true	/test verify
pull-dm-integration-test	f750bf7	link	true	/test dm-integration-test
pull-dm-compatibility-test	f750bf7	link	true	/test dm-compatibility-test

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

This pull request is closed because its related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

https://prow.tidb.net/command-help#cherrypick
https://book.prow.tidb.net/#/plugins/cherrypicker