enhance: [2.4] Add param item for segmentFlushInterval (#34629)

[congqixia]

Cherry-pick from master
pr: #34629
See also #28817

Add paramitem for segment flush interval

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.42%. Comparing base (4e02e57) to head (02b7ead).
Report is 4 commits behind head on 2.4.

Additional details and impacted files

@@             Coverage Diff             @@
##              2.4   #34663       +/-   ##
===========================================
+ Coverage   69.74%   84.42%   +14.68%     
===========================================
  Files        1045      786      -259     
  Lines      136250   112545    -23705     
===========================================
- Hits        95021    95019        -2     
+ Misses      37018    13310    -23708     
- Partials     4211     4216        +5     

Files	Coverage Δ
internal/datacoord/segment_allocation_policy.go	87.95% <100.00%> (ø)
internal/datacoord/segment_info.go	87.09% <100.00%> (ø)
pkg/util/paramtable/component_param.go	98.49% <100.00%> (+<0.01%)	⬆️

... and 288 files with indirect coverage changes