Use the new preview screen when tapping media on the room and pinned events screens. (#3736)

* Use the new TimelineMediaPreview modifier on the room and pinned timeline screens.

* Use the same presentation logic for all timeline media previews.

* Fix a bug with the detection of the timeline end.

* Send pagination requests from the media preview screen.

* Add SwiftLint to the Danger workflow (it is no longer installed on the runner).

* Put SwiftLint back on all of the GitHub runners too.

* Set the function_parameter_count lint rule to 10.

* Make sure to clean-up any previews when the coordinator is done.

* Handle the viewInRoomTimeline action more appropriately.

ElementX/Sources/Screens/FilePreviewScreen/View/TimelineMediaPreviewController.swift

@@ -182,7 +182,7 @@ class TimelineMediaPreviewController: QLPreviewController {
         }
     }
     
-    private func handleFileLoaded(itemID: TimelineItemIdentifier) {
+    private func handleFileLoaded(itemID: TimelineItemIdentifier.EventOrTransactionID) {
         guard (currentPreviewItem as? TimelineMediaPreviewItem.Media)?.id == itemID else { return }
         refreshCurrentPreviewItem()
     }
@@ -301,7 +301,8 @@ private struct DownloadIndicatorView: View {
     private var shouldShowDownloadIndicator: Bool {
         switch currentItem {
         case .media(let mediaItem): mediaItem.fileHandle == nil
-        case .loading(let loadingItem): loadingItem.state == .paginating
+        case .loading(.paginatingBackwards), .loading(.paginatingForwards): true
+        case .loading: false
         }
     }