planner: fix the issue that planner hints don't work in some batch/point-get plans (#23666)

[ti-srebot]

cherry-pick #23666 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/23685

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

git push [email protected]:ti-srebot/tidb.git pr/23685:release-5.0-60111e1c4b6f

---

What problem does this PR solve?

Issue Number: close #23570

Problem Summary: planner: fix the issue that planner hints don't work in some batch/point-get plans

What is changed and how it works?

Add some logic about checking planner hints in TryFastPlan.
Please see the root cause and more details in #23570.

Check List

Tests

• Unit test

Release note

• planner: fix the issue that planner hints don't work in some batch/point-get plans

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[rebelice]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rebelice
• winoros

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[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 2d78e82

[qw4990]

/merge

[qw4990]

This PR can be merged, PTAL @zz-jason

[qw4990]

/merge

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