Fix a potential race condition when redacting a message. (#3061)

* Refactor the timeline item menu action provider.

- Move it into its own struct.
- Use an item, not an ID so it doesn't randomly change.
- Move permissions into the room screen view model.

* Use the stable ID when redacting/editing/forwarding a message.

Just like we do when fetching the item in the actions menu.

ElementX/Sources/Services/Timeline/TimelineItems/RoomTimelineItemProtocol.swift

@@ -20,3 +20,10 @@ import UIKit
 protocol RoomTimelineItemProtocol {
     var id: TimelineItemIdentifier { get }
 }
+
+extension RoomTimelineItemProtocol {
+    var isReactable: Bool {
+        guard let eventItem = self as? EventBasedTimelineItemProtocol else { return false }
+        return !eventItem.isRedacted && !eventItem.hasFailedToSend && !eventItem.hasFailedDecryption
+    }
+}