clean unit tests core part 2 (#4897)

* promote use setupTestbed

* fix context menu unit test

* fix sidebar warning unit test

* fix spy people widget

* fix ISO warning date time widget

* fix sidebar spy 404 url

* minor karma fix import pdf.js map

* restore md

* revert extension change

lib/core/context-menu/context-menu-holder.component.spec.ts

@@ -76,6 +76,7 @@ describe('ContextMenuHolderComponent', () => {
         component = fixture.componentInstance;
         contextMenuService = TestBed.get(ContextMenuService);
 
+        component.ngOnDestroy = () => {};
         fixture.detectChanges();
     });