chore: remove Apache license header from generated files (backport #5565)

[mergify]

This is an automatic backport of pull request #5565 done by Mergify.
Cherry-pick of fdac0e2 has failed:

On branch mergify/bp/release-1.6/pr-5565
Your branch is up to date with 'origin/release-1.6'.

You are currently cherry-picking commit fdac0e281.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   api/common/v1alpha1/zz_generated.deepcopy.go
	both modified:   mk/generate.mk
	deleted by us:   pkg/plugins/policies/donothingpolicy/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/donothingpolicy/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshaccesslog/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshaccesslog/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshcircuitbreaker/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshcircuitbreaker/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshhealthcheck/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshhealthcheck/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshratelimit/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshratelimit/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshretry/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtimeout/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtimeout/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtrace/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtrace/k8s/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtrafficpermission/api/v1alpha1/zz_generated.deepcopy.go
	deleted by us:   pkg/plugins/policies/meshtrafficpermission/k8s/v1alpha1/zz_generated.deepcopy.go
	both modified:   pkg/plugins/resources/k8s/native/api/v1alpha1/zz_generated.deepcopy.go
	added by us:     pkg/plugins/resources/k8s/native/hack/boilerplate.go.txt
	both modified:   pkg/plugins/resources/k8s/native/test/api/sample/v1alpha1/zz_generated.deepcopy.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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