ddl: cherrypick some PRs to fix MDL bug

[wjhuang2016]

cherry-pick #46921 and #46752

What problem does this PR solve?

Issue Number: close #46920

Problem Summary:

What is changed and how it works?

1. Check once for every DDL job.
2. Check if waitSchemaChange is returned correctly.

Check List

Tests

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

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5-20230625-v6.5.3@5d19713). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-6.5-20230625-v6.5.3     #47079   +/-   ##
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  Branches                               ?          0           
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  Hits                                   ?     254326           
  Misses                                 ?      75694           
  Partials                               ?      16428           

[zimulala]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, zimulala

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-19 16:06:22.718075886 +0000 UTC m=+619948.685663938: ☑️ agreed by tangenta.
• 2023-09-20 06:32:12.675430783 +0000 UTC m=+671898.643018833: ☑️ agreed by zimulala.