Add logs to debug user being disconnected randomly (#16037)

As per title, just adding logs to troubleshoot:
https://github.com/twentyhq/twenty/issues/13103

packages/twenty-front/src/modules/apollo/utils/getTokenPair.ts

@@ -7,6 +7,9 @@ export const getTokenPair = (): AuthTokenPair | undefined => {
   const stringTokenPair = cookieStorage.getItem('tokenPair');
 
   if (!isDefined(stringTokenPair)) {
+    // eslint-disable-next-line no-console
+    console.log('tokenPair is undefined');
+
     return undefined;
   }