statistics: skip reading mysql.stats_histograms if cached stats is up-to-date (#24175)

[ti-srebot]

cherry-pick #24175 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24317

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---

What problem does this PR solve?

Issue Number: close #24096

Problem Summary:

There is no write in the cluster, while mysql.stats_histograms is repeatedly read.

What is changed and how it works?

What's Changed:

Skip reading mysql.stats_histograms if the cached stats is up-to-date.

Related changes

N/A

Check List

Tests

• Unit test

Side effects

N/A

Release note

• Skip reading mysql.stats_histograms if cached stats is up-to-date

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[crazycs520]

/lgtm

[ti-chi-bot]

@crazycs520: /lgtm is only allowed for the reviewers in list.

In response to this:

/lgtm

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[time-and-fate]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• time-and-fate
• winoros

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[eurekaka]

/merge

[ti-chi-bot]

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

Commit hash: e30bebe6a74dc1648f5957ddd118958ec293c537

[eurekaka]

/merge

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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