config: be compatible with deprecated stmt-summary config items

[qw4990]

What problem does this PR solve?

Issue Number: close #33337

Problem Summary: config: be compatible with deprecated stmt-summary config items

What is changed and how it works?

config: be compatible with deprecated stmt-summary config items

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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:

• djshow832
• winoros

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[winoros]

LGTM, but we should remove it in one version. It must throw out an error in the near future?

[qw4990]

LGTM, but we should remove it in one version. It must throw out an error in the near future?

Seem like it, that should be decided by our PM. For release-6.0, we'd better keep it now.

[djshow832]

/merge

[qw4990]

This approach to fix #33337 is not correct, I'll submit another PR later.