Remove feature flag CollapseRoomStateEvents. It was not used anyway.

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -22,10 +22,6 @@ enum class FeatureFlags(
     override val description: String? = null,
     override val defaultValue: Boolean = true
 ) : Feature {
-    CollapseRoomStateEvents(
-        key = "feature.collapseroomstateevents",
-        title = "Collapse room state events",
-    ),
     ShowStartChatFlow(
         key = "feature.showstartchatflow",
         title = "Show start chat flow",

libraries/featureflag/impl/src/main/kotlin/io/element/android/libraries/featureflag/impl/BuildtimeFeatureFlagProvider.kt

@@ -29,7 +29,6 @@ class BuildtimeFeatureFlagProvider @Inject constructor() :
     override suspend fun isFeatureEnabled(feature: Feature): Boolean {
         return if (feature is FeatureFlags) {
             when (feature) {
-                FeatureFlags.CollapseRoomStateEvents -> false
                 FeatureFlags.ShowStartChatFlow -> false
                 FeatureFlags.ShowMediaUploadingFlow -> false
             }