Add tests for CreateUserWithInviteId and CreateUserWithHash (#6363)

i18n/en.json

@@ -2479,6 +2479,14 @@
     "id": "api.user.create_user.signup_email_disabled.app_error",
     "translation": "User sign-up with email is disabled."
   },
+  {
+    "id": "api.user.create_user.missing_invite_id.app_error",
+    "translation": "Missing Invite Id."
+  },
+  {
+    "id": "api.user.create_user.missing_hash_or_data.app_error",
+    "translation": "Missing Hash or URL query data."
+  },
   {
     "id": "api.user.create_user.signup_link_expired.app_error",
     "translation": "The signup link has expired"