Store buffer patch2

[clux]

a patch for #1494.
feel free to cherry pick.

[codecov]

Codecov Report

Attention: Patch coverage is 77.01149% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 74.9%. Comparing base (a6f4337) to head (b1bb452).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1497     +/-   ##
=======================================
+ Coverage   74.9%   74.9%   +0.1%     
=======================================
  Files         78      78             
  Lines       6806    6860     +54     
=======================================
+ Hits        5091    5136     +45     
- Misses      1715    1724      +9     

Files	Coverage Δ
kube-runtime/src/controller/mod.rs	29.9% <100.0%> (ø)
kube-runtime/src/reflector/dispatcher.rs	96.2% <100.0%> (+0.7%)	⬆️
kube-runtime/src/reflector/mod.rs	100.0% <100.0%> (ø)
kube-runtime/src/utils/event_modify.rs	95.5% <100.0%> (ø)
kube-runtime/src/utils/reflect.rs	100.0% <100.0%> (ø)
kube-runtime/src/utils/event_flatten.rs	89.8% <91.7%> (-2.1%)	⬇️
kube-runtime/src/reflector/store.rs	91.8% <69.7%> (-7.3%)	⬇️
kube-runtime/src/watcher.rs	39.8% <48.3%> (+1.9%)	⬆️

... and 2 files with indirect coverage changes