Poll history - read only list of polls in current timeline (#10055)

* add settings while under development

* very basic tests for roomsummarycard

* empty poll history dialog and option in room summary

* pollS history in settings

* render an ugly list of polls in current timeline

* readonly poll history list items

* fix scroll window

* use short year code in date format, tidy

* no results message + tests

* strict fix

* mock intldatetimeformat for stable date formatting

* extract date format fn into date-utils

* jsdoc

test/components/views/right_panel/RoomSummaryCard-test.tsx

@@ -145,7 +145,7 @@ describe("<RoomSummaryCard />", () => {
 
             fireEvent.click(getByText("Polls history"));
 
-            expect(modalSpy).toHaveBeenCalledWith(PollHistoryDialog, { roomId });
+            expect(modalSpy).toHaveBeenCalledWith(PollHistoryDialog, { roomId, matrixClient: mockClient });
         });
     });