chore: improve controllers apps component coverage

[leon-ape]

Summary

• add stable Ginkgo/Gomega coverage for component workload helper edge cases
• cover host-network allocation, deletion skip, placement annotation, legacy config-manager cleanup decisions, and pod template diff helpers
• raise controllers/apps/component coverage from 78.1% to 80.4%
• no production code changes

Tests

• KUBEBUILDER_ASSETS= GOFLAGS=-mod=mod GOCACHE= go test -short ./controllers/apps/component -coverprofile=
• GOFLAGS=-mod=mod GOCACHE= go tool cover -func=

[apecloud-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.60%. Comparing base (93ec22c) to head (468eefb).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10380      +/-   ##
==========================================
+ Coverage   53.26%   53.60%   +0.33%     
==========================================
  Files         533      533              
  Lines       63529    63532       +3     
==========================================
+ Hits        33839    34055     +216     
+ Misses      26249    26039     -210     
+ Partials     3441     3438       -3     

Flag	Coverage Δ
unittests	53.60% <ø> (+0.33%)	⬆️

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[leon-ape]

/approve