Enable HA Control Plane by Default for Production Clusters and Provide Warnings

[grolu]

Description:
Currently, non-HA cluster configurations can lead to kube-apiserver unavailability caused by etcd restarts. This issue often results in repeated RCA requests. To improve the user experience and reduce downtime, consider the following enhancements:

1. Default HA for Production Clusters:
   Automatically select the HA (High Availability) checkbox by default when a cluster is designated as "production." This ensures that critical workloads are less susceptible to outages.

2. Confirmation Prompt for Non-HA Production Clusters:
   If a user attempts to run a production cluster in non-HA mode, display a confirmation prompt:
   "Are you sure you want to run this production cluster in non-HA mode?"
   This prompt is similar to the approach used for hibernation schedules and encourages users to reconsider their configuration.

3. Reminders for Existing Non-HA Clusters:
   For existing production clusters that are currently non-HA, provide a reminder or hint (e.g., a banner or icon in the cluster list) indicating that HA is not enabled. This gentle nudge can help teams that may have overlooked the HA option to revisit their cluster configuration.

These enhancements aim to reduce downtime, minimize RCA requests related to etcd restarts in single-control-plane setups, and increase awareness of HA options for production clusters.