planner: remove unused binding metrics

[qw4990]

What problem does this PR solve?

Issue Number: ref #51347

Problem Summary: planner: remove unused binding metrics

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

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-11 10:04:52.737808456 +0000 UTC m=+679919.760054844: ☑️ agreed by AilinKid.
• 2024-03-11 10:10:32.302757228 +0000 UTC m=+680259.325003617: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

Merging #51665 (951ba8d) into master (2b63184) will increase coverage by 1.4697%.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51665        +/-   ##
================================================
+ Coverage   70.7112%   72.1810%   +1.4697%     
================================================
  Files          1473       1473                
  Lines        437089     437090         +1     
================================================
+ Hits         309071     315496      +6425     
+ Misses       108639     101959      -6680     
- Partials      19379      19635       +256     

Flag	Coverage Δ
integration	47.2294% <100.0000%> (?)

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	47.7796% <ø> (+1.9406%)	⬆️