[Docs]: Add HA docs for Google Cloud Kubernetes and Microk8s, if applicable

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### Use cases or user requests

We [have this information for AWS EKS](https://docs.appsmith.com/getting-started/setup/installation-guides/kubernetes/configure-high-availability), but not for the other methods of installation listed on the [installation page](https://docs.appsmith.com/getting-started/setup/installation-guides/kubernetes).

Add more information on deploying appsmith on microk8s/minikube which helps in deploying appsmith locally with HA.

Also, currently our helm charts work on GKE but, we never documented the steps to deploy appsmith on GKE with HA and without HA.