ddl: fix create partition table error under NO_UNSIGNED_SUBTRACTION (#25435)

[ti-srebot]

cherry-pick #25435 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25556

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What problem does this PR solve?

Issue Number: close #24880, related to #24150

Problem Summary:

• create partition table error while using 'NO_UNSIGNED_SUBTRACTION…

What is changed and how it works?

What's Changed:

• Change some logic in some check functions when creating partition tables.

How it Works:

• Consider session's SQLMode during correctness check when creating partition tables.
• But the current insert behavior is not the same as MySQL. This needs to be fixed afterwards.

Check List

Tests

• Unit test

Side effects

• N/A

Release note

• ddl: fix create partition table error under NO_UNSIGNED_SUBTRACTION

[ti-srebot]

/run-all-tests

[ti-srebot]

@wjhuang2016 you're already a collaborator in bot's repo.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• rebelice

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[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 9e0809b

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