test: speed up domain.Close() in test

[Defined2014]

What problem does this PR solve?

Issue Number: ref #45961

Problem Summary:

Speed up domain.Close(), which can reduce the time consumption of test exit.

What is changed and how it works?

Check List

Tests

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

Add a test case below

func TestTest(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("select 1")
}

Reduce time consume from 3.0s to 1.4s

reduce integration_serial_test from 182s to 44s, if #42521 merged, it will reduce to 20s.

• 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.

None

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

Merging #46610 (bc2f974) into master (1cf3201) will decrease coverage by 0.6839%.
The diff coverage is 83.3333%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46610        +/-   ##
================================================
- Coverage   73.3375%   72.6536%   -0.6839%     
================================================
  Files          1310       1331        +21     
  Lines        394941     401158      +6217     
================================================
+ Hits         289640     291456      +1816     
- Misses        86858      91211      +4353     
- Partials      18443      18491        +48     

Flag	Coverage Δ
integration	25.3743% <83.3333%> (?)
unit	73.3443% <83.3333%> (+0.0068%)	⬆️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	84.9520% <ø> (ø)
br	48.0004% <ø> (-4.3260%)	⬇️

[Defined2014]

/test unit-test

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[Defined2014]

/test unit-test

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[hawkingrei]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-04 05:05:38.274554321 +0000 UTC m=+2335502.823570293: ☑️ agreed by xhebox.
• 2023-09-04 05:22:23.546471224 +0000 UTC m=+2336508.095487196: ☑️ agreed by tangenta.