Show WorkspaceTemplate for only users who have required UserAddons

[jlandowner]

Summary

Show WorkspaceTemplate for only users who have required UserAddons.

Background

Currently on UI, to show WorkspaceTemplate or not is controlled only by UserRole.

In some usecase, WorkspaceTemplate is dependent on UserAddon, for example, which create RBAC(ServiceAccount, rolebinding etc.) or volumes(PersistentVolume etc.)

Solutions

Show WorkspaceTemplate for only users who have required UserAddons.
This feature is similar to UserRole so add required-useraddons annotation on WorkspaceTemplate and used in Workspace Create Dialog.

cosmo-workspace.github.io/required-useraddons: myteam-role,myteam-volume