support uninstallation of local cluster using kn

[viveksahu26]

Feature request

Currently, kn cli support installation of knative on kind and minikube cluster with the help quickstart plugin as a sub-command. But it was does not support to uninstall them.

For uninstallation of kind it should be: kn quickstart kind uninstall and for minikube: kn quickstart uninstall minikube uninstall

Use case

Provide a easiness to do that. Removes overhead from user. Beginner friendly.

UI Example

[viveksahu26]

@aliok , I will love to take this.

[aliok]

cc @dsimansk

I am not 100% sure if we should have such functionality OR if we should simply add instructions to the "Uninstallation" section of the docs here that tells what to delete etc: https://knative.dev/docs/install/uninstall/

[dsimansk]

@viveksahu26 can you please follow up in the quickstart plugin repository? I can't move the issue due to different orgs.

https://github.com/knative-sandbox/kn-plugin-quickstart/issues

/cc @psschwei

[psschwei]

We do have a clean up section in the docs for how to delete quickstart clusters, but it's easy to miss given that it's in the tutorial

[dsimansk]

There are step by step instruction to remove the cluster. But for the local kind or minikube instances it's probably easier to recreate the whole cluster at once.

@viveksahu26 do you feel like quickstart uninstall would be still a valid addition? E.g. moving between Knative versions maybe?

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