test: scaffold e2e tests

[arturshadnik]

Description

This PR re-scaffolds the project using kubebuilder alpha generate. This is a follow-up to #185.

• Updates a few things that were missed in the last PR wrt. metrics service
• 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 170 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%	11 Missing ⚠️

@@             Coverage Diff             @@
##             main     #189       +/-   ##
===========================================
- Coverage   64.25%   48.45%   -15.81%     
===========================================
  Files           9       10        +1     
  Lines         512      679      +167     
===========================================
  Hits          329      329               
- Misses        164      331      +167     
  Partials       19       19               

Files with missing lines	Coverage Δ
api/v1alpha1/maasvalidator_types.go	76.92% <ø> (ø)
internal/controller/maasvalidator_controller.go	57.57% <ø> (ø)
cmd/main.go	0.00% <0.00%> (ø)
tests/utils/utils.go	0.00% <0.00%> (ø)

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[TylerGillson]

As you work through all of the plugins, you'll end up duplicating the E2E test helper code many times.

We many want to consider centralizing the test setup utils in the validator repo.

Also, given that we're already using DevSpace, I'm not 100% sold on introducing dev container config.