enhance: [hotfix2.4.5] Cherry pick some crucial fixes

[congqixia]

Cherry-pick from 2.4
pr: #33996 #33940 #34004 #34020 #34126 #34185 #34195 #34210 #34240

[sre-ci-robot]

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[congqixia]

/run-cpu-e2e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.95%. Comparing base (7f47f0d) to head (26eb16a).
Report is 1 commits behind head on hotfix-2.4.5.

Additional details and impacted files

@@              Coverage Diff              @@
##           hotfix-2.4.5   #34658   +/-   ##
=============================================
  Coverage         81.94%   81.95%           
=============================================
  Files              1015     1015           
  Lines            129462   129477   +15     
=============================================
+ Hits             106094   106116   +22     
+ Misses            19363    19357    -6     
+ Partials           4005     4004    -1     

Files	Coverage Δ
internal/datacoord/channel_manager_v2.go	85.74% <100.00%> (+0.06%)	⬆️
internal/datanode/importv2/task_import.go	86.50% <100.00%> (+0.32%)	⬆️
internal/datanode/importv2/task_l0_import.go	78.68% <100.00%> (+0.53%)	⬆️
internal/datanode/importv2/task_l0_preimport.go	84.31% <100.00%> (ø)
internal/datanode/importv2/task_preimport.go	91.45% <100.00%> (ø)
internal/kv/tikv/txn_tikv.go	83.56% <100.00%> (ø)
internal/querynodev2/pkoracle/candidate.go	100.00% <100.00%> (ø)
internal/querynodev2/segments/manager.go	78.15% <100.00%> (+0.09%)	⬆️
internal/rootcoord/broker.go	89.74% <100.00%> (ø)
internal/util/initcore/init_core.go	90.47% <100.00%> (+0.37%)	⬆️
... and 1 more

... and 23 files with indirect coverage changes

[czs007]

/lgtm