Promote "history sharing on invite" out of developer options (#5480)

* Enable key-share-on-invite irrespective of feature flag

* Remove feature-flag dep: warning on starting chat with new people

* Remove feature-flag dep: invite from room member details

* Remove feature-flag dep: warning on new users in invite screen

* Remove feature-flag dep: from room details screen

* Remove feature-flag dep: starting chat from user profile screen

* Remove feature-flag dep: timeline info on forwarded keys

* Remove feature-flag dep: RoomScreenModel

* Remove `enableKeyShareOnInvite` from AppSettings

* Remove `enableKeyShareOnInvite` feature flag

* Remove outdated comments

* Update preview test room snapshots as their header now includes the history sharing icon

ElementX/Sources/Screens/Timeline/TimelineViewModel.swift

@@ -107,7 +107,6 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
                                                        emojiProvider: emojiProvider,
                                                        linkMetadataProvider: hideTimelineMedia ? nil : linkMetadataProvider,
                                                        mapTilerConfiguration: appSettings.mapTilerConfiguration,
-                                                       enableKeyShareOnInvite: appSettings.enableKeyShareOnInvite,
                                                        bindings: .init(reactionsCollapsed: [:])),
                    mediaProvider: userSession.mediaProvider)