Output Switcher shouldn't enable transfer when apps don't support

If a media route provider can support transfer, the route will be marked
as transferable. If the app can support transfer, the app will include
the route in the RouteListingPreference. If neither the media route
provider nor the app could support transfer, then the route can't
support transfer and the full item shouldn't be clickable when the route
is selectable to support expansion.

Flag: com.android.media.flags.disable_transfer_when_apps_do_not_support
Test: presubmit and manually tested with demo app
Bug: b/373404114
Fix: b/373404114
Change-Id: Ic8c41563df4e5e0e6b1ddff557f88dcc765c2f1f