executor, privilege: require CONFIG or Process privilege for is.cluster_* (#26220)

[ti-srebot]

cherry-pick #26220 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/26297

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

git push [email protected]:ti-srebot/tidb.git pr/26297:release-5.1-946b3841e7f0

---

What problem does this PR solve?

Issue Number: close #26121,#26122,#26123,#26124,#26126

Problem Summary:
The information_schema.cluster_* tables should require the CONFIG or Process privilege. This is consistent with the behavior change in #25379 which requires CONFIG for SHOW CONFIG.

It makes sense to cherry pick to 5.1, but not 5.0; because the behavior in 5.0 was not established yet, and SHOW CONFIG still requires no privileges.

What is changed and how it works?

What's Changed:

Reading from the table information_schema.cluster_hardware now requires the CONFIG privilege.
Reading from the table information_schema.cluster_{info,load,systeminfo,log} now requires the CONFIG privilege.

Check List

Tests

• Unit test

Side effects

• Breaking backward compatibility (for security)

Release note

• Reading from the table information_schema.cluster_hardware now requires the CONFIG privilege.
• Reading from the table information_schema.cluster_info now requires the Process privilege.
• Reading from the table information_schema.cluster_load now requires the Process privilege.
• Reading from the table information_schema.cluster_systeminfo now requires the Process privilege.
• Reading from the table information_schema.cluster_log now requires the Process privilege.

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[AilinKid]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AilinKid
• djshow832

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[AilinKid]

/merge

[ti-chi-bot]

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

Commit hash: 16da8c9

[ti-chi-bot]

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