session: set EnableWindowFunction for all SessionVars (#55991)

[winoros]

Manually cherry-pick #55991

What problem does this PR solve?

Issue Number: ref #55981

Problem Summary:

What changed and how does it work?

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

[winoros]

/test check-dev2

[tiprow]

@winoros: No presubmit jobs available for pingcap/tidb@release-6.5

In response to this:

/test check-dev2

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qw4990, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-10 16:29:33.581196396 +0000 UTC m=+373843.321620332: ☑️ agreed by qw4990.
• 2024-09-10 17:02:07.883070808 +0000 UTC m=+375797.623494744: ☑️ agreed by time-and-fate.

[winoros]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-6.5@305cf42). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #55992   +/-   ##
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  Coverage               ?   73.6251%           
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  Files                  ?       1097           
  Lines                  ?     352859           
  Branches               ?          0           
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  Hits                   ?     259793           
  Misses                 ?      76353           
  Partials               ?      16713