Fix invalid token after credentials change (#4717)

- If sync fails we set authFailedAt
- This information is displayed in the frontend in accounts with a `Sync
Failed` pill
- The user can reconnect his account in the dropdown menu
- A new OAuth flow is triggered
- The account is synced

packages/twenty-front/src/modules/accounts/types/ConnectedAccount.ts

@@ -11,5 +11,6 @@ export type ConnectedAccount = {
   refreshToken: string;
   accountOwnerId: string;
   lastSyncHistoryId: string;
+  authFailedAt: Date | null;
   messageChannels: MessageChannelConnection;
 };