Fix ringing calls not stopping when the other user cancels the call (#4613)

* Fix ringing calls not being automatically canceled

This will keep the sync active while the user is screening an incoming call, allowing receiving a call cancellation event, which will terminate the incoming call ringing early.

* Add extra logs to help debugging ringing call issues.

services/appnavstate/test/src/main/kotlin/io/element/android/services/appnavstate/test/FakeAppForegroundStateService.kt

@@ -13,11 +13,13 @@ import kotlinx.coroutines.flow.MutableStateFlow
 class FakeAppForegroundStateService(
     initialForegroundValue: Boolean = true,
     initialIsInCallValue: Boolean = false,
-    initialIsSyncingNotificationEventValue: Boolean = false
+    initialIsSyncingNotificationEventValue: Boolean = false,
+    initialHasRingingCall: Boolean = false,
 ) : AppForegroundStateService {
     override val isInForeground = MutableStateFlow(initialForegroundValue)
     override val isInCall = MutableStateFlow(initialIsInCallValue)
     override val isSyncingNotificationEvent = MutableStateFlow(initialIsSyncingNotificationEventValue)
+    override val hasRingingCall = MutableStateFlow(initialHasRingingCall)
 
     override fun startObservingForeground() {
         // No-op
@@ -34,4 +36,8 @@ class FakeAppForegroundStateService(
     override fun updateIsSyncingNotificationEvent(isSyncingNotificationEvent: Boolean) {
         this.isSyncingNotificationEvent.value = isSyncingNotificationEvent
     }
+
+    override fun updateHasRingingCall(hasRingingCall: Boolean) {
+        this.hasRingingCall.value = hasRingingCall
+    }
 }