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

config/auth_ldap_group/ldap/vault_access.yaml

@@ -1,2 +0,0 @@
-policies:
-  - "default_access"

config/auth_ldap_group/ldap/vault_admin.yaml

@@ -1,3 +1,3 @@
-policies:
-  - "default_access"
-  - "global-admin"
+---
+# this file doesnt need anything in it, so this data is just to make sure yamlencode reads some yaml data
+description: foo