executor: inherit memory quota from user session for admin check

[tangenta]

What problem does this PR solve?

Issue Number: close #49258

Problem Summary:

ADMIN CHECK is implemented with running queries with internal sessions. tidb_mem_quota_query is not initialized for internal session.

What changed and how does it work?

Inherit ADMIN CHECK session variable tidb_mem_quota_query for internal session.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

  mysql> admin check index sbtest1 idx;
  ERROR 8175 (HY000): Your query has been cancelled due to exceeding the allowed memory limit for a single SQL query. Please try narrowing your query scope or increase the tidb_mem_quota_query limit and try again.[conn=0]
  mysql> set session tidb_mem_quota_query = -1;
  Query OK, 0 rows affected (0.00 sec)
  
  mysql> admin check index sbtest1 idx;
  Query OK, 0 rows affected (1 min 23.84 sec)
  

• No need to test

  • I checked and no code files have been changed.

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.

None

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[codecov]

Codecov Report

Merging #49260 (c7d7fea) into master (be62f75) will increase coverage by 0.9901%.
Report is 2 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #49260        +/-   ##
================================================
+ Coverage   71.0499%   72.0400%   +0.9901%     
================================================
  Files          1368       1406        +38     
  Lines        402241     413413     +11172     
================================================
+ Hits         285792     297823     +12031     
- Misses        96570      96801       +231     
+ Partials      19879      18789      -1090     

Flag	Coverage Δ
integration	43.6836% <100.0000%> (?)
unit	71.0498% <ø> (-0.0002%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9663% <ø> (ø)
parser	∅ <ø> (∅)
br	48.2512% <ø> (-4.6804%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wjhuang2016, zimulala

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-07 09:45:11.358773135 +0000 UTC m=+1693540.023999330: ☑️ agreed by wjhuang2016.
• 2023-12-07 10:07:59.546269559 +0000 UTC m=+1694908.211495753: ☑️ agreed by zimulala.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #49262.