*: split the TestScheduler

[rleungx]

What problem does this PR solve?

Issue Number: Ref #7062.

What is changed and how does it work?

This PR splits out the diagnostic part since it belongs to an independent feature. The previous test is over coupling. After we solve #7062, we can enable the test again. Now, it affects the CI efficiency.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• lhy1024

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[rleungx]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 4bbe829