txn: check MDL when starting and committing pipelined txns

[ekexium]

What problem does this PR solve?

Issue Number: ref #50215

Problem Summary:

What changed and how does it work?

Ensure MDL is ON when starting and committing pipelined txns

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]

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[codecov]

Codecov Report

Merging #51794 (07b3e39) into master (a1cad29) will increase coverage by 2.0399%.
Report is 12 commits behind head on master.
The diff coverage is 0.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51794        +/-   ##
================================================
+ Coverage   70.7470%   72.7870%   +2.0399%     
================================================
  Files          1476       1476                
  Lines        437518     437567        +49     
================================================
+ Hits         309531     318492      +8961     
+ Misses       108612      99043      -9569     
- Partials      19375      20032       +657     

Flag	Coverage Δ
integration	48.8016% <0.0000%> (?)
unit	70.4950% <0.0000%> (-0.0738%)	⬇️

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	51.4484% <ø> (+5.5199%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MyonKeminta, you06

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-15 04:17:52.439082791 +0000 UTC m=+1004699.461329179: ☑️ agreed by you06.
• 2024-03-15 05:05:29.649846902 +0000 UTC m=+1007556.672093290: ☑️ agreed by MyonKeminta.