Error handling for missing docker-registry module should have a clear call to action

[kwiatekus]

Description

Error handling for missing docker-registry module should have a clear instruction how to enable docker registry from experimental channel

Reasons

Installing docker registry may be tricky as the experimental channel needs to be specified. Lets not loose the user on the way of the journey in case he doesn't know how to do that.

Attachments
For example:

kyma alpha app push --name bookstore --expose --container-port 3000 --dockerfile .

Error:
  failed to load in-cluster registry configuration

Error Details:
  failed to load in-cluster registry configuration: the server could not find the requested resource

Hints:
  - make sure cluster is available and properly configured
  - enable docker registry module by calling `kyma alpha module enable docker-registry -c experimental`

Related
Depends on #2274