refactor(query-graphql): improve console.log mock implementation in integration tests

- Replace global console.log override with jest.spyOn() for safer mocking
- Use mockRestore() instead of manual restoration for better cleanup
- Remove unnecessary originalLog variable declaration
- Keep optional debug output comment for development flexibility

This addresses the code review feedback about avoiding global console.log override
which could interfere with test output and debugging while following Jest best practices.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Diluka

packages/query-graphql/__tests__/integration/federation-n1/federation-n1-integration.spec.ts

@@ -19,7 +19,6 @@ describe('Federation N+1 Integration Test (Based on User Demo)', () => {
   let dataSource: DataSource
   let queryCount: number
   let executedQueries: string[]
-  let originalLog: any
 
   beforeAll(async () => {
     // Setup query monitoring to track SQL execution
@@ -203,12 +202,11 @@ describe('Federation N+1 Integration Test (Based on User Demo)', () => {
 
       // Capture console output to verify DataLoader logs
       const consoleLogs: string[] = []
-      originalLog = console.log
-      console.log = jest.fn((...args) => {
+      const logSpy = jest.spyOn(console, 'log').mockImplementation((...args) => {
         const message = args.join(' ')
         consoleLogs.push(message)
-        // eslint-disable-next-line @typescript-eslint/no-unsafe-call
-        originalLog(...args)
+        // Optionally, call the original implementation if you want logs to still appear:
+        // jest.requireActual('console').log(...args)
       })
 
       const query = `
@@ -223,7 +221,7 @@ describe('Federation N+1 Integration Test (Based on User Demo)', () => {
       await request(app.getHttpServer()).post('/graphql').send({ query }).expect(200)
 
       // Restore console.log
-      console.log = originalLog
+      logSpy.mockRestore()
 
       // Check for DataLoader debug logs (optional in test environment)
       const dataLoaderLogs = consoleLogs.filter((log) => log.includes('DataLoaderFactory') || log.includes('ReferenceLoader'))