[FEATURE] Cleanup outdated tokens

[mdryankov]

Is your feature request related to a problem? Please describe.
There are situations when the user record contains old outdated firebase tokens. This produce pressure on notification BB, because e message is attempt to be send to all tokens.

Acoording to the documentation the Firebase team advices such tokens to be removed.
https://firebase.google.com/docs/cloud-messaging/manage-tokens

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[shurwit]

This is a duplicate of #116