feat(distribution): deprecate installer

[oliverbaehler]

We don't want to distribute capsule via installer.yaml files. Therefor we can deprecate all actions regarding to the installer yaml and add more resiliency for the chart. For most actions (e2e) (dev-setup) we already use the helm chart.

[prometherion]

Yes, the single YAML file installer was used at the beginning of the project.

I used that in the past just to extract the generated CRDs files referenced then in the Helm chart, I guess it's safe to remove it entirely, ensuring any reference in the documentation is removed.

[maxgio92]

Hello @prometherion @oliverbaehler, now that the CRD lifecycle has been introduced I think we can deprecate the single manifest installer. WDYT?

I just opened a PR for that, in the meantime, in draft status.