Report room and decline & block screens tweaks (#4044)

* report rom and decline and block screens tweaks

- Use the copies: "Leave room" and "Report room" everywhere, also in DMs
- Report reason in report room is now mandatory.
- Report reason in decline and block is now mandatory if the report action is set to on.
- Generic alert for failure of main API in both report room and decline and block has been added

* report room and decline and block screen previews

ElementX/Sources/Screens/ReportRoomScreen/ReportRoomScreenModels.swift

@@ -13,6 +13,10 @@ enum ReportRoomScreenViewModelAction: Equatable {
 
 struct ReportRoomScreenViewState: BindableState {
     var bindings = ReportRoomScreenViewStateBindings()
+    
+    var canReport: Bool {
+        !bindings.reason.isEmpty
+    }
 }
 
 struct ReportRoomScreenViewStateBindings {
@@ -27,5 +31,6 @@ enum ReportRoomScreenViewAction {
 }
 
 enum ReportRoomScreenAlertType {
+    case reportRoomFailed
     case leaveRoomFailed
 }