MLE-31901 Remove xdmp-login

Removed `xdmp-login` from rest-evaluator role.
Deleted rest-login role, since it only had the `xdmp-login` privilege.
Removed the rest-login role from rest-reader user.
Deleted rest-transform-user user, since it is not used anywhere.

Author: jonmille

test-app/src/main/ml-config/security/roles/rest-evaluator.json

@@ -51,11 +51,6 @@
       "action": "http://marklogic.com/xdmp/privileges/xdmp-get-session-field",
       "kind": "execute"
     },
-    {
-      "privilege-name": "xdmp-login",
-      "action": "http://marklogic.com/xdmp/privileges/xdmp-login",
-      "kind": "execute"
-    },
     {
       "privilege-name": "unprotected-collections",
       "action": "http://marklogic.com/xdmp/privileges/unprotected-collections",

test-app/src/main/ml-config/security/roles/rest-login.json

@@ -4,7 +4,6 @@
   "password": "x",
   "role": [
     "rest-reader",
-    "rest-extension-user",
-    "rest-login"
+    "rest-extension-user"
   ]
 }