[Sb refactor] Check groupUuid in subscription filtering

This was a bit of logic missing from the migration from the old
pipeline. When filtering subscriptions based on their opportunistic
fields, we first need to check that they are both in the same group (per
SubscriptionInfo.getGroupUuid()).

Test: MobileIconsInteractorTest
Fixes: 268533422
Change-Id: I4f035c83d074cddb45f03c996fce0a3e10797b11