types: clip to zero when convert negative decimal to uint

[LittleFall]

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]

[REVIEW NOTIFICATION]

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• qw4990
• windtalker

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #41811.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #41812.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #41813.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #41814.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #41815.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.0: #41816.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #41817.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.2: #41818.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #41819.

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tidb#release-6.5 from head ti-chi-bot:cherry-pick-41791-to-release-6.5: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between pingcap:release-6.5 and ti-chi-bot:cherry-pick-41791-to-release-6.5"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request"}

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tidb#release-6.1 from head ti-chi-bot:cherry-pick-41791-to-release-6.1: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between pingcap:release-6.1 and ti-chi-bot:cherry-pick-41791-to-release-6.1"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request"}