Provide homeroomAnnouncements on HomeroomPage.test.js

flag=none

test plan:
  - Specs pass

qa risk: low

Change-Id: Ifa3f6f7c06d2f4f9c059644ffea48ab6fdd9642e
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274400
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

@@ -103,7 +103,6 @@ const ignoredErrors = [
   /The prop `focusOnInit` is marked as required in `(FileUpload|TextEntry|UrlEntry)`/,
   /The prop `groupTitle` is marked as required in `(GroupMoveModal|GroupRemoveModal|SearchBreadcrumb)`/,
   /The prop `hasLoaded` is marked as required in `HistoryList`/,
-  /The prop `homeroomAnnouncements` is marked as required in `HomeroomPage`/,
   /The prop `host` is marked as required in `CanvasContentTray`/,
   /The prop `id` is marked as required in `(CanvasSelectOption|ColHeader|DashboardCard|FormField|Option)`/,
   /The prop `imageUrl` is marked as required in `GenericErrorPage`/,

ui/features/k5_dashboard/react/__tests__/HomeroomPage.test.js

@@ -26,6 +26,7 @@ describe('HomeroomPage', () => {
     createPermissions: 'admin',
     loadingAnnouncements: false,
     loadingCards: false,
+    homeroomAnnouncements: [],
     ...overrides
   })