enhance: Add integration tests for l0

[XuanYang-cn]

pr: #35429
See also: #34796

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.91%. Comparing base (bafc5a8) to head (1ded0d4).
Report is 24 commits behind head on 2.4.

Additional details and impacted files

@@             Coverage Diff             @@
##              2.4   #35430       +/-   ##
===========================================
+ Coverage   71.90%   84.91%   +13.01%     
===========================================
  Files        1056      788      -268     
  Lines      137827   113795    -24032     
===========================================
- Hits        99104    96631     -2473     
+ Misses      34495    12928    -21567     
- Partials     4228     4236        +8     

Files	Coverage Δ
...ternal/datanode/compaction/clustering_compactor.go	67.63% <100.00%> (ø)
internal/datanode/compaction/compactor_common.go	91.81% <100.00%> (ø)

... and 294 files with indirect coverage changes

[weiliu1031]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, XuanYang-cn

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• internal/datanode/OWNERS [congqixia]
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