Fix integration tests logic

[congqixia]

• Skip reinsert in show index stats test case
• Fix show replica logic error
• Add singleton logic in gc_tuner
• Create folder for GenerateNumpyFile
• Remove continue-on-error for integration test job

Related to #24017 /kind improvement

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia

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[codecov[bot]]

Codecov Report

Merging #24063 (e569a79) into master (f6dec28) will decrease coverage by 0.08%. The diff coverage is 74.43%.

@@            Coverage Diff             @@
##           master   #24063      +/-   ##
==========================================
- Coverage   82.14%   82.07%   -0.08%     
==========================================
  Files         754      754              
  Lines       98672    98871     +199     
==========================================
+ Hits        81055    81146      +91     
- Misses      14635    14702      +67     
- Partials     2982     3023      +41     

Impacted Files	Coverage Δ
pkg/util/paramtable/base_table.go	80.53% <0.00%> (ø)
pkg/util/gc/gc_tuner.go	68.67% <68.75%> (-11.82%)	:arrow_down:
pkg/util/paramtable/quota_param.go	75.51% <70.61%> (-2.71%)	:arrow_down:
internal/proxy/multi_rate_limiter.go	89.68% <100.00%> (+1.01%)	:arrow_up:
internal/rootcoord/quota_center.go	87.78% <100.00%> (-2.30%)	:arrow_down:

... and 17 files with indirect coverage changes

[mergify[bot]]

@congqixia ut workflow job failed, comment rerun ut can trigger the job again.

[jiaoew1991]

/lgtm