fix(install): simplify kustomize procedure

[squakez]

This PR aims to provide a simplified approach to the Kustomize. Thanks (to @gansheer) to the work done so far to identify exactly all resources during installation, it is now relatively easy to create a base and an overlay directory that we can use as a base for any user to extend according to their specific needs. This is also quite easy as it provides a set of sensible configuration we can use in our test or documentation.

We can remove the make which was an attempt to provide a ui on top of something that is probably thought to be customized on source directly by the final users.

If this gets merged, we can work on additional overlays (ie, openshift) as a follow up activity.

Closes #4528

Release Note

fix(install): simplify kustomize procedure

[gansheer]

This is a very good first simplified version !
I put some comments on the commands I tested for a global kubernetes installation.

[gansheer]

Another thing to report is that on descoped installation the rolebindings referenced directly on camel-k/install/base/config/rbac/kustomization.yaml still contains placeholder value :

subjects:
- kind: ServiceAccount
  name: camel-k-operator
  namespace: placeholder

The rolebindings from camel-k/install/base/config/rbac/descoped/kustomization.yaml are good since you removed the namespace: placeholder line in the subjects declaration.

I remember when I stumbled on it that there is some kind of hack from kustomize code that make it replace with the given namespace if the value in the yaml is default.

Also you might break the CLI installation if make some changes in these files.

[squakez]

Another thing to report is that on descoped installation the rolebindings referenced directly on camel-k/install/base/config/rbac/kustomization.yaml still contains placeholder value :

Yeah, I've noticed that at well, the change will be included with next commit. I think those values where required and replaced by the make UI that was developed on top of Kustomize and which this PR is removing.