Stop waiting for a room alias that the remote server never resolves (#7446)

Tapping a room alias whose server is down left the resolver screen on a
spinner for as long as the screen stayed open, with no way forward other
than going back.

Bound the resolution with the ten second timeout already used when
joining a room by address, so the retry dialog is shown instead. The fake
client's resolve lambda becomes suspending so a server that never answers
can be simulated.

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/FakeMatrixClient.kt

@@ -100,7 +100,7 @@ class FakeMatrixClient(
     override val roomMembershipObserver: RoomMembershipObserver = RoomMembershipObserver(),
     private val homeserverCapabilitiesProvider: FakeHomeserverCapabilitiesProvider = FakeHomeserverCapabilitiesProvider(),
     private val accountManagementUrlResult: (AccountManagementAction?) -> Result<String?> = { lambdaError() },
-    private val resolveRoomAliasResult: (RoomAlias) -> Result<Optional<ResolvedRoomAlias>> = {
+    private val resolveRoomAliasResult: suspend (RoomAlias) -> Result<Optional<ResolvedRoomAlias>> = {
         Result.success(
             Optional.of(ResolvedRoomAlias(A_ROOM_ID, emptyList()))
         )