Reapply "Create CallStateRepository.isInCallFlow"

This reverts commit 93e4c65d3d9bde366362d58be18715ba74483311.

Fixed the test by cherry-pick change
I7a3d27cb53c930a56ab0f0896b545807bf4f9dc0.

Bug: 336209156
Test: manual - on MobileNetworkSwitchController
Test: atest SubscriptionInfoListViewModelTest
Change-Id: Id606d6ee90acd8a98de706d8533fed0aac96bff4
9 files changed