cdc: region worker should handle stale events correctly (#9078)

[ti-chi-bot]

This is an automated cherry-pick of #9078

What problem does this PR solve?

Issue Number: close #9072

What is changed and how it works?

Region worker should handle stale events correctly.

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

None

[ti-chi-bot]

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[hicqu]

/merge

[nongfushanquan]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asddongmen, nongfushanquan

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-16 08:54:57.373043054 +0000 UTC m=+335093.787647130: ☑️ agreed by nongfushanquan.
• 2023-06-19 03:21:47.848314304 +0000 UTC m=+574304.262918382: ☑️ agreed by asddongmen.

[asddongmen]

/test all

[asddongmen]

/run-all-tests

[hicqu]

/merge

[hicqu]

/merge

[hicqu]

/merge

[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	e74ab70	link	true	/test verify

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[hicqu]

It's hard to fix the failed test case. I don't know why GRPC reports an error which will cause region worker restart. And then we can't receive an event as expected.