fix: [2.5] Record a map to avoid repeatedly traversing the CompactionFrom

[xiaocai2333]

issue: #38811

master pr: #38925

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.04%. Comparing base (4533fc8) to head (1bdedb6).

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38926      +/-   ##
==========================================
- Coverage   81.05%   81.04%   -0.02%     
==========================================
  Files        1383     1383              
  Lines      195517   195537      +20     
==========================================
- Hits       158469   158464       -5     
- Misses      31471    31493      +22     
- Partials     5577     5580       +3     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.45% <ø> (ø)
Go	83.02% <100.00%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
internal/datacoord/handler.go	81.46% <100.00%> (+1.71%)	⬆️

... and 30 files with indirect coverage changes

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