90252: Invalidate requests containing DSO on DataService.delete

Keep track of a list of request UUIDs in the object cache (most recent in front)
When deleting a DSO, mark all of these as stale

src/app/shared/mocks/request.service.mock.ts

@@ -13,6 +13,7 @@ export function getMockRequestService(requestEntry$: Observable<RequestEntry> =
     isCachedOrPending: false,
     removeByHrefSubstring: observableOf(true),
     setStaleByHrefSubstring: observableOf(true),
+    setStaleByUUID: observableOf(true),
     hasByHref$: observableOf(false)
   });
 }