Remove the createSpan method entirely

As it's easier to live without it than to deal with the API redesign or or misuse
panics.

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

@@ -251,15 +251,6 @@ class RoomSummaryProvider: RoomSummaryProviderProtocol {
             return currentItems
         }
         
-        // The span guard is thread local, so it must not straddle a suspension
-        // point, otherwise the task could resume on a different thread and
-        // unbalance it, causing a panic and subsequent (intentional) crash.
-        let span = MXLog.createSpan("\(name).apply_room_list_diff")
-        span.enter()
-        defer {
-            span.exit()
-        }
-        
         guard let updatedItems = currentItems.applying(collectionDiff) else {
             MXLog.error("\(name): Failed applying diff: \(collectionDiff)")
             return currentItems

ElementX/Sources/Services/Timeline/TimelineItemProvider.swift

@@ -99,12 +99,6 @@ class TimelineItemProvider: TimelineItemProviderProtocol {
     private static func processDiffs(_ diffs: [TimelineDiff],
                                      on currentItems: [TimelineItemProxy],
                                      spanName: String) async -> (itemProxies: [TimelineItemProxy], hasMembershipChange: Bool) {
-        let span = MXLog.createSpan(spanName)
-        span.enter()
-        defer {
-            span.exit()
-        }
-        
         var hasMembershipChange = false
         
         let itemProxies = diffs.reduce(currentItems) { currentItems, diff in