Add a Low Priority room filter behind a feature flag. (#4394)

* Add Low Priority room filter with incompatibility rules

Co-authored-by: pixlwave <6060466+pixlwave@users.noreply.github.com>

* Add a feature flag and use the SDK filters.

* Fix filter tests and add RoomSummaryProvider tests for the default filters.

* Remove unnecessary comment.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pixlwave <6060466+pixlwave@users.noreply.github.com>
Co-authored-by: Doug <douglase@element.io>

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/View/DeveloperOptionsScreen.swift

@@ -50,6 +50,10 @@ struct DeveloperOptionsScreen: View {
                 Toggle(isOn: $context.fuzzyRoomListSearchEnabled) {
                     Text("Fuzzy searching")
                 }
+                
+                Toggle(isOn: $context.lowPriorityFilterEnabled) {
+                    Text("Low priority filter")
+                }
             }
             
             Section("Timeline") {