chore: re-scaffold project

[arturshadnik]

Issue

#108

Description

This PR re-scaffolds the project using kubebuilder alpha generate. The 2 major changes are:

• Remove all usage of kube-rbac-proxy and replace with WithAuthenticationAndAuthorization due to kube-rbac-proxy being deprecated
• Initialize e2e tests. For now, we are only testing basic functionality. The tests should be expanded to cover validator-specific use-cases.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 218 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tests/utils/utils.go	0.00%	159 Missing ⚠️
cmd/main.go	0.00%	59 Missing ⚠️

@@           Coverage Diff            @@
##            main    #109      +/-   ##
========================================
- Coverage   0.86%   0.38%   -0.48%     
========================================
  Files          4       5       +1     
  Lines        232     515     +283     
========================================
  Hits           2       2              
- Misses       230     513     +283     

Files with missing lines	Coverage Δ
api/v1alpha1/kubescapevalidator_types.go	14.28% <ø> (-2.39%)	⬇️
...ternal/controller/kubescapevalidator_controller.go	0.00% <ø> (ø)
cmd/main.go	0.00% <0.00%> (ø)
tests/utils/utils.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[mattwelke]

There are actually a few changes needed for this plugin. There are open PRs for them. One thing to fix is this, which I don't think there's a PR open to address yet:

Vulnerability #1: GO-2024-3171
    Link Following in github.com/containers/common
  More info: https://pkg.go.dev/vuln/GO-2024-3171
  Module: github.com/containers/common
    Found in: github.com/containers/common@v0.5[9](https://github.com/validator-labs/validator-plugin-kubescape/actions/runs/12250020952/job/34172287129?pr=109#step:5:10).0
    Fixed in: github.com/containers/common@v0.60.4
    Example traces found:
      #1: internal/validators/kubescape.go:[10](https://github.com/validator-labs/validator-plugin-kubescape/actions/runs/12250020952/job/34172287129?pr=109#step:5:11):2: validators.init calls v1beta1.init, which calls seccomp.init

We could try to address that check during this PR or merge this in without that check passing yet.