Potential fix for code scanning alert no. 340: Unused variable, import, function or class

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: OmegaCreations

Tokenization/backend/wrapper/src/test/client/ConnectionManager/Interceptors/grpc.auth.interceptor.test.ts

@@ -332,7 +332,6 @@ describe('gRPCAuthInterceptor', () => {
 });
 
 describe('isRequestAllowed', () => {
-  const mockCallback = jest.fn();
 
   beforeEach(() => {
     jest.restoreAllMocks();