More conservative clippy fixes

[clux]

this fixes CI, but doesn't clean up the unused imports that arise from being used with features, might do that later.

(running clippy --fix without --all-features is a bad idea #1416)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.2%. Comparing base (45c2ebb) to head (a88704b).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1417   +/-   ##
=====================================
  Coverage   72.2%   72.2%           
=====================================
  Files         75      75           
  Lines       6485    6485           
=====================================
  Hits        4680    4680           
  Misses      1805    1805           

Files	Coverage Δ
kube-client/src/api/subresource.rs	44.0% <100.0%> (ø)
kube-runtime/src/events.rs	97.3% <ø> (ø)
kube-runtime/src/watcher.rs	38.2% <ø> (ø)