*: add warn log for stale read (#30340)

[ti-srebot]

cherry-pick #30340 to release-5.3
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/30351

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

git push git@github.com:ti-srebot/tidb.git pr/30351:release-5.3-6475e8949cf4

---

Signed-off-by: yisaer disxiaofei@163.com

What problem does this PR solve?

add warn log for stale read to help debug.

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• xhebox

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[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]

/run-all-tests

[ti-srebot]

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

[xhebox]

@Yisaer need cherry-pick approval, maybe contact someone to help?

[guo-shaoge]

@Yisaer please remember to merge this pr. Thnaks!