New K8s clients provider for Kapp and Resources plugins

[castelblanque]

Description of the change

3rd and final PR related to K8s Go clients optimization (#5358 and #5379)
In this one, Kapp and Resources plugins code have been refactored. Previously used client getter has been removed.
Now all plugins use the same client getter/provider.

Instead of creating two clients most of the times and ignoring one:

typedClient, _, err := s.GetClients(ctx, cluster)
...
_, dynClient, err := s.GetClients(ctx, cluster)

now each one can be created independently:

typedClient, err := s.clientGetter.Typed(ctx, cluster)
...
dynClient, err := s.clientGetter.Dynamic(ctx, cluster)

Benefits

• Faster creation of K8s clients in Go. E.g. No need to create the dynamic client when only the typed one is necessary.
• Unified management of K8s clients in all plugins.

Possible drawbacks

N/A

Applicable issues

• Partially fixes Requests for catalog delayed #4919
• Fixes Extend usage of new clients provider in Kubeapps APIs #5362

Additional information

There is still lag when creating a dynamic client and using pinniped-proxy. This might be related to K8s APIs throttling from Rust.

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[antgamdia]

Awesome, thanks for fanning the change out of every plugin!