🪟 🐛 Fix duplicate createUser calls on signup (#21454)

* revert useEffect causing multiple user creations

airbyte-webapp/src/packages/cloud/services/auth/AuthService.tsx

@@ -1,5 +1,5 @@
 import { User as FirebaseUser } from "firebase/auth";
-import React, { useCallback, useContext, useEffect, useMemo, useRef } from "react";
+import React, { useCallback, useContext, useMemo, useRef } from "react";
 import { useQueryClient } from "react-query";
 import { useEffectOnce } from "react-use";
 import { Observable, Subject } from "rxjs";
@@ -160,23 +160,6 @@ export const AuthenticationProvider: React.FC<React.PropsWithChildren<unknown>>
     });
   });
 
-  useEffect(() => {
-    const onFocus = async () => {
-      return auth.onAuthStateChanged(async (currentUser) => {
-        if (!currentUser) {
-          loggedOut();
-        } else {
-          await onAfterAuth(currentUser);
-        }
-      });
-    };
-
-    window.addEventListener("focus", onFocus);
-    return () => {
-      window.removeEventListener("focus", onFocus);
-    };
-  }, [auth, loggedOut, onAfterAuth]);
-
   const queryClient = useQueryClient();
 
   const ctx: AuthContextApi = useMemo(