enhance: Select L2 segments in L0Compaction as well (#32991)

[bigsheeper]

/kind improvement

pr: #32991

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.80%. Comparing base (7de9311) to head (ccf364a).

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #32992      +/-   ##
==========================================
- Coverage   81.86%   81.80%   -0.06%     
==========================================
  Files         992     1001       +9     
  Lines      125609   125368     -241     
==========================================
- Hits       102829   102558     -271     
- Misses      18884    18912      +28     
- Partials     3896     3898       +2     

Files	Coverage Δ
internal/datacoord/compaction.go	88.19% <100.00%> (ø)

... and 206 files with indirect coverage changes

[mergify]

@bigsheeper E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[xiaofan-luan]

/approve

[sre-ci-robot]

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