Add Maestro tests for create & join rooms (#472)

I created 2 additional test users to use them as MXID we lookup during room creation.

I.e. we will not login as those users, it's just 2 known MXIDs that we know exist so we can look them up.

- https://github.com/vector-im/element-x-android/issues/409

.maestro/tests/roomList/roomList.yaml

@@ -1,6 +1,8 @@
 appId: ${APP_ID}
 ---
-- takeScreenshot: build/maestro/300-RoomList
 - runFlow: searchRoomList.yaml
+- takeScreenshot: build/maestro/300-RoomList
 - runFlow: timeline/timeline.yaml
-
+- runFlow: roomContextMenu.yaml
+- runFlow: createAndDeleteRoom.yaml
+- runFlow: createAndDeleteDM.yaml