schedule: add check action when poll the opeators from opNotifierQueue (#8010)

[ti-chi-bot]

This is an automated cherry-pick of #8010

What problem does this PR solve?

Issue Number: Close #7992

What is changed and how does it work?

It add light check for polling the opeators from Controller::opNotifierQueue. 
For example, check whether the region has disappeared，check whether the version of region epoch has changed for merge-region operator.
It has the chance to cancel the operators from Controller::opNotifierQueue execept timeout. We can only cancel the operator by timeout mechanism before.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

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Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci/build	1558840	link	true	/test build

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[lhy1024]

/ok-to-test