#1515 Migrate to Kubewarden admission controller single Helm chart

[xingzhang-suse]

Entry of the installation page

Authentication step
(Create http secret for adding repositories)

Adding repositories step
(Add repositories and duplicate image pulling secret for installation)

Installation step

Redirecting to Rancher UI's apps installation page

[kravciak]

hi, I automated installation from AppCo MR here.
It's WIP, sharing to show what repositories/values you can use to try with AppCo before it's released.

I tested with appco from MR. I found those initial issues:

• default namespace should be: cattle-kubewarden-system
• default app name should be: rancher-admission-controller
• AppCo Registry Auth page: Namespace, Insecure plain HTTP, Skip TLS verification - are those related to AppCo Auth?

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• dashboard overview page has: %kubewarden.dashboard.cards.generic.policies.empty%

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• default policy server is not installed... banner should be removed, chart does not exist anymore

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• new policy server should have the same module as default one (default is installed by helm chart)
  https://github.com/user-attachments/assets/16e210d6-74db-4dac-aee9-f2d4bc47f49b

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• editing policies managed by admission-controller chart should redirect to rancher-apps
  • policy type should be admission-controller, not custom

Currently in this PR:
https://github.com/user-attachments/assets/a503cee9-ae17-4833-8cbc-a58d585bebb6

Expected workflow (I enabled recommended policies during chart installation):
https://github.com/user-attachments/assets/c0fdb4a1-4b4c-4600-82c6-43899131e20a