The operator stores the cluster file in the <release>-config ConfigMap,
but the dashboard resource map did not list it and no RBAC granted
tenant subjects access to it, so a tenant could not retrieve the
connection string for its own FoundationDB at all.
Add the ConfigMap to the dashboard resource map and create a
Role/RoleBinding scoped to exactly that ConfigMap (get/list/watch)
for the tenant use-level subjects. Add helm unittest coverage.
Signed-off-by: Yan Bondarenko <202671653+yankawai@users.noreply.github.com>
