ddl: remove mock.Context ref in ddl/session/session_pool.go

[lcwangchao]

What problem does this PR solve?

Issue Number: close #53377

What changed and how does it work?

Remove mock.Context ref in production code in ddl/session/session_pool.go

Check List

Tests

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

[tiprow]

Hi @lcwangchao. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.6832%. Comparing base (f5ac93e) to head (e696855).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53378        +/-   ##
================================================
+ Coverage   72.6006%   74.6832%   +2.0826%     
================================================
  Files          1505       1505                
  Lines        429827     429996       +169     
================================================
+ Hits         312057     321135      +9078     
+ Misses        98577      89011      -9566     
- Partials      19193      19850       +657     

Flag	Coverage Δ
integration	49.2515% <66.6666%> (?)
unit	71.3816% <66.6666%> (-1.2108%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.4470% <ø> (+9.0463%)	⬆️

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, YangKeao

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• pkg/ddl/OWNERS [tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-20 07:12:18.773972494 +0000 UTC m=+2069292.531108065: ☑️ agreed by tangenta.
• 2024-05-20 07:28:22.905732508 +0000 UTC m=+2070256.662868077: ☑️ agreed by YangKeao.

[lcwangchao]

/retest

[tiprow]

@lcwangchao: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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