Revert "enhance: trigger compaction by size (#32326)"

[tedxu]

This reverts commit fef7812.

[mergify]

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[mergify]

@tedxu

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[czs007]

/approve
/lgtm

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[codecov]

Codecov Report

Attention: Patch coverage is 85.41667% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 81.76%. Comparing base (51e0855) to head (723137c).
Report is 384 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #32745      +/-   ##
==========================================
+ Coverage   81.58%   81.76%   +0.17%     
==========================================
  Files         976      998      +22     
  Lines      120147   124375    +4228     
==========================================
+ Hits        98019   101689    +3670     
- Misses      18396    18809     +413     
- Partials     3732     3877     +145     

Files	Coverage Δ
internal/datacoord/compaction_trigger.go	83.08% <85.41%> (ø)

... and 259 files with indirect coverage changes