planner,executor: fix point get for update read panic on partition table (#25537)

[ti-srebot]

cherry-pick #25537 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25552

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git push git@github.com:ti-srebot/tidb.git pr/25552:release-5.1-5645edeec639

---

What problem does this PR solve?

Issue Number: close #25528

Problem Summary:

#21148 add an extra partition ID column for the select lock executor, the table reader can handle it, but I forget the point / batch point get executor.

What is changed and how it works?

What's Changed:

Do not convert to point get executor for that case.
I see #21148 is already cherry picked to 5.1 and it introduce this bug, so it's better to fix the bug quickly.
This fix is simplest.

How it Works:

Avoid generate point get executor for that case.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

• Performance regression
  • Consumes more CPU

Release note

Fix a bug which is caused by prior bug fix PR

• No release note

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lysu
• qw4990

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[lysu]

@zhouqiang-cl please help give a label thx~

[lysu]

/merge

[ti-chi-bot]

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

Commit hash: 8950532

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