Refine polls UI in the timeline (#1474)

* Add summary view in PollRoomTimelineView

* Add selectedPollOption action

* Handle undisclosed polls

* Add more logics in PollRoomTimelineView

* Refine ended poll UI

* Refine poll layout

* More UI refinements

* Fix layout issue

* Refine progress bar

* Add poll mocks and UI tests

* Cleanup

ElementX/Sources/UITests/UITestsScreenIdentifier.swift

@@ -45,6 +45,8 @@ enum UITestsScreenIdentifier: String {
     case roomLayoutTop
     case roomLayoutMiddle
     case roomLayoutBottom
+    case roomWithDisclosedPolls
+    case roomWithUndisclosedPolls
     case sessionVerification
     case userSessionScreen
     case roomDetailsScreen