sink(cdc): fix "dead dmlSink" error in sink workers (#9686)

[ti-chi-bot]

This is an automated cherry-pick of #9686

What problem does this PR solve?

Issue Number: close #9685 .

What is changed and how it works?

Call defer func() { handleSpecialSinkInternalErrors() } before fetchFromCache.

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]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hicqu

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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
pull-cdc-integration-mysql-test	e1c4a1b	link	unknown	/test cdc-integration-mysql-test

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[hicqu]

/retest