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]

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[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test 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	c376b12	link	true	/test verify

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