session: fix data race in TestBootstrap (#39718)

[ti-chi-bot]

This is an automated cherry-pick of #39718

What problem does this PR solve?

Issue Number: close #39682

Problem Summary:

mustExec only open the executor, but not close it. We need close the recordSet by manual.

What is changed and how it works?

Check List

Tests

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

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-6.5@7bcef4f). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #49695   +/-   ##
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  Lines                  ?     381618           
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  Hits                   ?     294692           
  Misses                 ?      70994           
  Partials               ?      15932           

[zimulala]

/test unit-test

[tiprow]

@zimulala: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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