expression : prevent function DATE_ADD/SUB_STRING_XXX pushed down to TiFlash (#30154)

[ti-srebot]

cherry-pick #30154 to release-5.1
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/30158

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

git push git@github.com:ti-srebot/tidb.git pr/30158:release-5.1-e15b76875d98

---

What problem does this PR solve?

temporary preventing function DATE_ADD/SUB_STRING_XXX pushed down to TiFlash because this function has some unsolvable
problems in TiFlash

Issue Number: close #30153

Release note

prevent function DATE_ADD/SUB_STRING_XXX pushed down to TiFlash

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-chi-bot]

@ti-srebot: 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.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[ti-srebot]

@mengxin9014 you're already a collaborator in bot's repo.

[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

• https://prow.tidb.io/command-help#cherrypick
• https://book.prow.tidb.net/#/plugins/cherrypicker

You can find more details at:

• https://internals.tidb.io/t/topic/785