Various UI test fixes (#370)

* Increase integration tests time limits again as they're still ocasionally failing

* Fixed NavigationRootCoordinator name in logs

* Refactor UI tests hierarchy and introduce new userFlowScreen

* Introduce a RoomTimelineControllerFactory so that it can be mocked in the UserFlow UI tests

* Start using a mock timeline controller for the UserSession flows

* Remove the WeakDictionary dependency and replce it with a plain NSMapTable in the BackgroundTaskService

* Allow multiple UITests screenshots per screen

* Prevent the view hierarchy changing when taking screenshots

* Add UserSessionScreen UI tests

* Fix label triaging workflow project identifier as per vector-im/element-ios/pull/7150

* Fix settings screen tests

* Fix roomPlainNoAvatar and roomEncryptedWithAvatar UI tests

* Fix modal server selection screen UI tests

* Fix bug report and login screen UI tests

* Fix text typing missing characters on UI tests

* Fix sliding sync configuration on integration tests

* Stop crashing if not finding a particular room through the MockClientProxy

ElementX/Sources/Services/Room/RoomSummary/MockRoomSummaryProvider.swift

@@ -55,7 +55,7 @@ class MockRoomSummaryProvider: RoomSummaryProviderProtocol {
                                             isDirect: true,
                                             avatarURLString: nil,
                                             lastMessage: AttributedString("Prosciutto beef ribs pancetta filet mignon kevin hamburger, chuck ham venison picanha. Beef ribs chislic turkey biltong tenderloin."),
-                                            lastMessageTimestamp: .now,
+                                            lastMessageTimestamp: .distantPast,
                                             unreadNotificationCount: 4)),
         .filled(details: RoomSummaryDetails(id: "2",
                                             name: "Second room",
@@ -69,7 +69,7 @@ class MockRoomSummaryProvider: RoomSummaryProviderProtocol {
                                             isDirect: true,
                                             avatarURLString: nil,
                                             lastMessage: try? AttributedString(markdown: "**@mock:client.com**: T-bone beef ribs bacon"),
-                                            lastMessageTimestamp: .now,
+                                            lastMessageTimestamp: .distantPast,
                                             unreadNotificationCount: 0)),
         .empty(id: "3")
     ]