[SB][Screen Chips] Show device name in stop dialog when screen casting.

Casting to another device can either trigger MediaRouter APIs (if only
audio is being cast) or MediaProjection APIs (if the screen is being
cast). Change Id9710270bafef03d5f0c4e1cece124df8fd59755 showed the device
name in the stop dialog if MediaRouter APIs were used. This change now
also shows the device name in the stop dialog if MediaProjection APIs
are used.

Fixes: 351851835
Bug: 332662551
Flag: com.android.systemui.status_bar_screen_sharing_chips

Test: Cast screen to another device, then tap chip -> verify stop dialog
includes device name
Test: Cast audio to another device, then tap chip -> verify stop dialog
includes device name
Test: Share your screen with another app, then tap chip -> verify stop
dialog includes name of app receiving the share (this verifies that
nothing goes wrong if we couldn't get the device name)
Test: atest MediaProjectionManagerRepositoryTest

Change-Id: I927471aae423d68357baaa3c7691334b58d09585