Memory not deallocated after logging in

[staskus]

Parent issue: #20989
Related issue: #21010

Login-related controllers are not deallocated after finishing the login. After repeating the login-logout sequence, login entities keep being allocated. A possible memory leak in the flow.

Expected behavior

Login-related controllers should be deallocated after finishing login or at least not be allocated multiple times.

Steps to reproduce the behavior

1. Open the fresh app
2. Login
3. Logout
4. Login
5. Open memory graph
6. Notice multiple instances of Login-related controllers still allocated

Tested on [device], iOS [version], Jetpack iOS / WordPress iOS 22.7