test: remove redundant JwtAuthGuard mock in unit test file

backend/src/modules/auth/guards/jwt-auth.guard.spec.ts

@@ -3,19 +3,6 @@ import { Reflector } from '@nestjs/core';
 import { JwtAuthGuard } from './jwt-auth.guard';
 import { IS_PUBLIC_KEY } from '../decorators/public.decorator';
 
-// Mock the AuthGuard
-jest.mock('@nestjs/passport', () => {
-  return {
-    AuthGuard: jest.fn().mockImplementation(() => {
-      return class {
-        canActivate() {
-          return true;
-        }
-      };
-    }),
-  };
-});
-
 describe('JwtAuthGuard', () => {
   let guard: JwtAuthGuard;
   let reflector: Reflector;