fix: Record a map to avoid repeatedly traversing the CompactionFrom

[xiaocai2333]

issue: #38811

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.16%. Comparing base (aa0a87e) to head (a8766f0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38925      +/-   ##
==========================================
+ Coverage   81.13%   81.16%   +0.02%     
==========================================
  Files        1387     1387              
  Lines      196268   196289      +21     
==========================================
+ Hits       159251   159313      +62     
+ Misses      31421    31391      -30     
+ Partials     5596     5585      -11     

Components	Coverage Δ
Client	79.12% <ø> (ø)
Core	69.54% <ø> (ø)
Go	83.12% <100.00%> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
internal/datacoord/handler.go	81.46% <100.00%> (+1.71%)	⬆️
internal/datacoord/index_service.go	93.29% <100.00%> (+<0.01%)	⬆️
internal/datacoord/server.go	73.22% <100.00%> (ø)

... and 22 files with indirect coverage changes

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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