Replace searchable modifiers with a custom implementation using UISearchController. (#2209)

Unfortunately the introspection became unreliable from iOS 17.1 onwards.

* Replace disableInteractiveDismissOnSearch and dismissSearchOnDisappear.

These can be handled within our searchController implementation now.

* Fix preview snapshots.

Weirdly, the search field is bigger in these, although it hasn't changed in the UI tests or the app itself.

ElementX/Sources/Screens/MessageForwardingScreen/View/MessageForwardingScreen.swift

@@ -57,8 +57,7 @@ struct MessageForwardingScreen: View {
                 .disabled(context.viewState.selectedRoomID == nil)
             }
         }
-        .searchable(text: $context.searchQuery, placement: .navigationBarDrawer(displayMode: .always))
-        .searchableConfiguration(hidesNavigationBar: false)
+        .searchController(query: $context.searchQuery, showsCancelButton: false)
         .compoundSearchField()
         .disableAutocorrection(true)
     }