planner: fix wrong cached plan in cachedPlanExec (#34579)

[ti-srebot]

cherry-pick #34579 to release-5.4
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/34599

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/34599:release-5.4-cd297b9f5ccd

---

What problem does this PR solve?

Issue Number: close #32371

Problem Summary: planner: fix wrong cached plan in cachedPlanExec

What is changed and how it works?

planner: fix wrong cached plan in cachedPlanExec

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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[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 you're already a collaborator in bot's repo.

[ti-chi-bot]

@ti-srebot: PR needs rebase.

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