Add config flag for CallingAccountSelector

Since CallingAccountSelector is currently the only action that requires a UI, disabling it will effectively revert the PreCall behavior back to pre-PreCall era, sending intents to telecom directly.

Bug: 68953196
Test: CallingAccountSelectorTest
PiperOrigin-RevId: 176398440
Change-Id: I612a56bc66f32cf72779bd7c507de6a0784f1298
1 file changed