Add detect-private-key to pre-commit

[lucacome]

Adds detect-private-key which detects the presence of private keys.

[codecov-commenter]

Codecov Report

Merging #3589 (35c415c) into main (fcf512f) will increase coverage by 0.16%.
The diff coverage is 85.89%.

❗ Current head 35c415c differs from pull request most recent head 50b351b. Consider uploading reports for the commit 50b351b to get more accurate results

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@@            Coverage Diff             @@
##             main    #3589      +/-   ##
==========================================
+ Coverage   52.14%   52.31%   +0.16%     
==========================================
  Files          59       59              
  Lines       16772    16849      +77     
==========================================
+ Hits         8746     8814      +68     
- Misses       7729     7738       +9     
  Partials      297      297              

Impacted Files	Coverage Δ
internal/configs/configurator.go	38.67% <ø> (ø)
internal/configs/version2/http.go	0.00% <ø> (ø)
internal/k8s/controller.go	11.97% <0.00%> (-0.05%)	⬇️
internal/configs/transportserver.go	97.90% <100.00%> (+0.37%)	⬆️
internal/configs/virtualserver.go	95.07% <100.00%> (+<0.01%)	⬆️
pkg/apis/configuration/validation/policy.go	91.41% <100.00%> (+0.24%)	⬆️
...g/apis/configuration/validation/transportserver.go	96.80% <100.00%> (+0.17%)	⬆️
...ternal/k8s/appprotect/app_protect_configuration.go	86.74% <0.00%> (+0.57%)	⬆️

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