log restore: fix the bottleneck of btree map

[3pointer]

What problem does this PR solve?

Issue Number: close #59900

Problem Summary:
The current log restore process accumulates small files, which can negatively impact performance. During performance testing, log restore took twice as long as before due to the excessive number of small files. To optimize performance, we should skip accumulating small files, as was done previously.

What changed and how does it work?

Check List

Tests

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

before this PR

after this PR

• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.7004%. Comparing base (b500d9e) to head (cd9dc1f).
Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59896        +/-   ##
================================================
+ Coverage   72.9585%   74.7004%   +1.7418%     
================================================
  Files          1700       1717        +17     
  Lines        469738     470992      +1254     
================================================
+ Hits         342714     351833      +9119     
+ Misses       105904      97312      -8592     
- Partials      21120      21847       +727     

Flag	Coverage Δ
integration	46.2401% <100.0000%> (?)
unit	72.2577% <100.0000%> (+0.0807%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.7466% <100.0000%> (+16.8630%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leavrth, YuJuncen

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-03-05 04:41:43.085352089 +0000 UTC m=+416616.214271834: ☑️ agreed by Leavrth.
• 2025-03-05 06:51:21.251945017 +0000 UTC m=+424394.380864761: ☑️ agreed by YuJuncen.

[3pointer]

/rebuild

[hawkingrei]

/retest