Add High Availability LKE cluster support

[LBGarber]

Proposed changes

This pull request adds an option to the LKE UI component for provisioning and updating Linode Kubernetes Engine clusters with High Availability Control Planes.

Types of changes

• New Feature

Linked Issues

Feature Request: https://github.com/rancher/rancher/issues/38189

Further comments

• There is currently a bug in kontainer-engine-driver-lke when updating only the High Availability field
  • https://github.com/linode/kontainer-engine-driver-lke/pull/19