chore: remove redundant register user mutation

packages/backend/src/graphql/mutations/register-user.ee.js

@@ -1,30 +0,0 @@
-import appConfig from '../../config/app.js';
-import User from '../../models/user.js';
-import Role from '../../models/role.js';
-
-const registerUser = async (_parent, params) => {
-  if (!appConfig.isCloud) return;
-
-  const { fullName, email, password } = params.input;
-
-  const existingUser = await User.query().findOne({
-    email: email.toLowerCase(),
-  });
-
-  if (existingUser) {
-    throw new Error('User already exists!');
-  }
-
-  const role = await Role.query().findOne({ name: 'User' });
-
-  const user = await User.query().insert({
-    fullName,
-    email,
-    password,
-    roleId: role.id,
-  });
-
-  return user;
-};
-
-export default registerUser;