partition: fix split and scatter region for truncate partition (#43271)

[ti-chi-bot]

This is an automated cherry-pick of #43271

What problem does this PR solve?

Issue Number: close #43174 close #43028

Problem Summary:

What is changed and how it works?

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

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

None

[ti-chi-bot]

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[mjonss]

/retest

[mjonss]

/retest

[bb7133]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, Defined2014

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-26 04:05:40.145415404 +0000 UTC m=+594105.546665851: ☑️ agreed by bb7133.
• 2023-06-26 04:09:22.365488305 +0000 UTC m=+594327.766738754: ☑️ agreed by Defined2014.

[bb7133]

/merge

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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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