Modernize code generation

[mikkeloscar]

This "modernizes" code generation setup to make it simpler to run and have less implicit dependencies. It does so in the following way:

• Use Go 1.24 tool feature to manage Go tool dependencies (no longer need for tools.go hack)
  • Drop the make tools directive as it will be implicitly working just when running go.
• Update hack/update-codegen.sh to not depend on a bash-script from the code-gen toolchain, instead run with the pure go implementing such that the tooling can be fully managed in go.mod
• Update k8s.io/code-generator from v0.25.9 to v0.32.9 (This is the same version used for other k8s libraries, and required for the modernization to work).
• Regenerate k8s client code, this has a bunch of changes because of the k8s.io/code-generator version update.
  • Add return in error cases when updating status in cluster.go and sync.go. This is needed because the newer version of the generated code doesn't return nil for the object on error, so if pgUpdatedStatus != nil checks are no longer valid to detect if it was not set. The right thing is to do this check as part of the error checking which is done by returning there.
• Drop use of go mod vendor which is not needed with the use of go tool.
• Drop make deps target as it's not needed to be explicitly called.

[mikkeloscar]

Closing in favor of #3003 (from local branch)