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We were getting weird errors around the service not calling
startForeground() that I couldn't reproduce. I figure it must be
something with how we only sometimes start the FcmFetchService in the
foreground. So I think the safest thing to do is to just use
GenericForegroundService.

Fix crash when trying to access media controller after activity is destroyed and reference is nullified.

If we're deferring to super.getItem(), then we should be guarding with
super.getItemCount().

Without starting from start index, if the same recipient appears
multiple times in the recipient list, this function will crash.

Fixes #12113