types: clip to zero when convert negative decimal to uint (#41791)

[ti-chi-bot]

This is an automated cherry-pick of #41791

What problem does this PR solve?

Issue Number: close #41736

Problem Summary:

see #41736 (comment)

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test

Release note

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

Fix a compare incorrect issue cause by fault convert 

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev_2	ce9ee23	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	ce9ee23	link	true	/test mysql-test

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[LittleFall]

close because of not LTS