ddl: make CompleteDeleteRange atomic by explicit transaction

[wjhuang2016]

Signed-off-by: wjhuang2016 huangwenjun1997@gmail.com

What problem does this PR solve?

Issue Number: close #33720

Problem Summary:
CompleteDeleteRange is not atomic.

What is changed and how it works?

Use explicit transaction

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  Create a database, and create many tables.
  During the drop databases. Check that the row count of the two tables is always the same.
• No code

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• MyonKeminta
• tangenta

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[wjhuang2016]

/merge

[ti-chi-bot]

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

Commit hash: 2e290b7

[ti-chi-bot]

@wjhuang2016: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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[wjhuang2016]

/run-mysql-test

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/cc09c4dbdec142f6dd648a57b1ba5252ae076072

[wjhuang2016]

/run-cla