refactor(webhook): refactor sidecar injection

[mlycore]

What is changed and how it works?

• refactor sidecar injection

[codecov]

Codecov Report

Merging #234 (08ce0f3) into master (ac4ece7) will increase coverage by 30.91%.
The diff coverage is 42.10%.

@@             Coverage Diff             @@
##           master     #234       +/-   ##
===========================================
+ Coverage   30.68%   61.59%   +30.91%     
===========================================
  Files           3        7        +4     
  Lines         264      427      +163     
===========================================
+ Hits           81      263      +182     
+ Misses        177      158       -19     
  Partials        6        6               

Flag	Coverage Δ
unittests	61.59% <42.10%> (+30.91%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pisa-controller/pkg/webhook/server.go	26.66% <0.00%> (ø)
pisa-controller/pkg/webhook/injection.go	18.58% <22.89%> (ø)
pisa-controller/pkg/proxy/http.go	57.89% <40.00%> (+57.89%)	⬆️
pisa-controller/pkg/webhook/types.go	64.00% <64.00%> (ø)
pisa-controller/pkg/proxy/builder.go	91.21% <100.00%> (+51.11%)	⬆️
pisa-controller/pkg/webhook/api_check.go	0.00% <0.00%> (ø)

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