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Uplift: For fenix#16232 - Make sure we cancel any in-progress auth #8978
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Prior to #7856 we only had a NotAuthenticated
state, which user would remain in until the very end of the authentication process (receiving a 'finished...' api call).
After the refactor, we introduced an in-progress states - specifically, BeginningAuthentication. If the user
cancels the auth flow (e.g. closes a custom tab), they will remain in this state. Subsequent login attempts
would then fail.
This patch fixes this by introducing a Cancel event which we trigger whenever handling 'beginAuthentication' calls.
In normal scenarios, this event is ignored. Otherwise, it "resets" the state machine into NotAuthenticated
state before emitting any Begin* events.
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After merge