chore: cleanup unused config data

- remove token_policies from roles config data, this comes from policies.hcl inputs
- remove policies from ldap groups
- remove backend data from roles, this comes from config.hcl inputs

modules/vault_cluster/variables.tf

@@ -58,7 +58,6 @@ variable "auth_ldap_group" {
   type = map(object({
     groupname = string
     backend   = string
-    policies  = list(string)
   }))
   default = {}
 }
@@ -287,4 +286,4 @@ variable "policy_rules_map" {
     capabilities = list(string)
   })))
   default = {}
-}
+}