Firebase Token retrieval fails silently in some cases

[BillCarsonFr]

In some cases Firebase token retrieval fails silently -> effect is that push will not work

This was detected thanks to a rageshake - >Crashes during notification troubleshooting (during the Firebase token part)

01-08 16:22:53.155Z 2 E/FcmHelper: ## ensureFcmTokenIsRetrieved() : failed Default FirebaseApp is not initialized in this process im.vector.alpha. Make sure to call FirebaseApp.initializeApp(Context) first.
01-08 16:22:53.157Z java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process im.vector.alpha. Make sure to call FirebaseApp.initializeApp(Context) first.
	at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.2:240)
	at com.google.firebase.iid.FirebaseInstanceId.getInstance(Unknown Source:1)
	at im.vector.push.fcm.FcmHelper.ensureFcmTokenIsRetrieved(FcmHelper.java:86)
	at im.vector.activity.LoginActivity.initUiAndData(LoginActivity.java:376)
	at im.vector.activity.VectorAppCompatActivity.onCreate(VectorAppCompatActivity.kt:99)
	at android.app.Activity.performCreate(Activity.java:7036)
	at android.app.Activity.performCreate(Activity.java:7027)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
	at android.app.ActivityThread.-wrap11(Unknown Source:0)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:164)
	at android.app.ActivityThread.main(ActivityThread.java:6501)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

https://github.com/matrix-org/riot-android-rageshakes/issues/3526

[BillCarsonFr]

Additional info here:
https://firebase.google.com/docs/reference/android/com/google/firebase/FirebaseApp

For a vast majority of apps, FirebaseInitProvider will handle the initialization of Firebase for the default project that it's configured to work with, via the data contained in the app's google-services.json file.

In the event that an app requires access to another Firebase project in addition to the default project, initializeApp(Context, FirebaseOptions, String) must be used to create that relationship programmatically.