inforschema: check the user permission before loading TIKV_REGION_STATUS

[CbcWestwolf]

What problem does this PR solve?

Issue Number: close #38407

Problem Summary:

We forget to check the permission while reading information_schema.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • tiup playground --db 1 --kv 1 --tiflash 0 --db.binpath ./bin/tidb-server
  • executes the commands in the issue
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix a permission issue in information_schema.TIKV_REGION_STATUS

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• xhebox
• xiongjiwei

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[CbcWestwolf]

/run-unit-test

[xiongjiwei]

/merge

[ti-chi-bot]

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

Commit hash: 1cccd80

[sre-bot]

TiDB MergeCI notify

🔴 Bad News! New failing [1] after this pr merged.
These new failed integration tests seem to be caused by the current PR, please try to fix these new failed integration tests, thanks!

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/integration-compatibility-test	🟥 failed 1, success 0, total 1	1 min 38 sec	New failing
idc-jenkins-ci-tidb/integration-ddl-test	✅ all 6 tests passed	29 min	Fixed
idc-jenkins-ci-tidb/integration-common-test	✅ all 17 tests passed	16 min	Fixed
idc-jenkins-ci-tidb/common-test	✅ all 11 tests passed	9 min 59 sec	Fixed
idc-jenkins-ci/integration-cdc-test	🟢 all 38 tests passed	20 min	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 48 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	4 min 27 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	4 min 8 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 9 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed