Provide closeTray to HelpTray

flag=none

test plan:
  - Specs pass

qa risk: low

Change-Id: I3730655f884e4eab7c386ff6153aaa0674ae2e41
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274418
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Davis Hyer <dhyer@instructure.com>
QA-Review: Davis Hyer <dhyer@instructure.com>
Product-Review: Davis Hyer <dhyer@instructure.com>

jest/jest-setup.js

@@ -86,7 +86,6 @@ const ignoredErrors = [
   /The prop `canAddObservee` is marked as required in `(K5Dashboard|ObserverOptions|ResponsiveK5Dashboard)`/,
   /The prop `canReadAnnouncements` is marked as required in `(K5Announcement|K5Course)`/,
   /The prop `children` is marked as required in `TruncateText`/,
-  /The prop `closeTray` is marked as required in `HelpTray`/,
   /The prop `color` is marked as required in `StatusColorListItem`/,
   /The prop `colors.late` is marked as required in `StatusColorPanel`/,
   /The prop `conferenceType.type` is marked as required in `Conference`/,

ui/features/navigation_header/react/trays/__tests__/HelpTray.test.js

@@ -42,7 +42,8 @@ describe('HelpTray', () => {
   const props = {
     trayTitle,
     links,
-    hasLoaded: true
+    hasLoaded: true,
+    closeTray: jest.fn()
   }
 
   beforeEach(() => {