refactor: refactored gql-auth-guard to work for websocket based subscriptions

packages/hoppscotch-backend/src/guards/gql-auth.guard.ts

@@ -6,6 +6,7 @@ import { AuthGuard } from '@nestjs/passport';
 export class GqlAuthGuard extends AuthGuard('jwt') {
   getRequest(context: ExecutionContext) {
     const ctx = GqlExecutionContext.create(context);
-    return ctx.getContext().req;
+    const { req, headers } = ctx.getContext();
+    return headers ? headers : req;
   }
 }