Use KAL linter for Kubernetes API definitions

[czeslavo]

Problem Statement

Defining Kubernetes API via Go types has its pitfalls. Some of them can be caught using a new KAL linter: https://github.com/JoelSpeed/kal.

Inspired by #238 (comment).

Proposed Solution

Use KAL as a standalone binary (as of now, it's not part of the golangcilint suite, so that should be the easiest way for now - we can migrate once it's included).

Acceptance Criteria

• All Kubernetes API types defined in this repository are linted using https://github.com/JoelSpeed/kal

[pmalek]

Linter location has moved to https://github.com/kubernetes-sigs/kube-api-linter (original link still works with a redirect to said new location).

[pmalek]

There's more to be done here (more linters and more API packages covered).

Some of this has been covered in:

• feat(ci): add kube-api-linter #451
• ci: add kube-api-linter for konnect/v1alpha1 #458
• ci: enable kube-api-linter for konnect/v1alpha2 #460