master, config(dm): fix case-sensitive compatibility for dmctl (#5307)

[ti-chi-bot]

This is an automated cherry-pick of #5307

Signed-off-by: lance6716 lance6716@gmail.com

What problem does this PR solve?

Issue Number: close #5255

What is changed and how it works?

OpenAPI needs automatically decides the case-sensitive from MySQL, but dmctl should keep the compatibility. So I split the two functions.

Check List

Tests

• Integration test

Code changes

Side effects

• Increased code complexity

Related changes

• Need to cherry-pick to the release branch

Release note

Fix DM can't replicate uppercase tables when the task has case-sensitive: false

[ti-chi-bot]

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