90978: Fix e2e tests failing due to interactions before page fully loaded

Now that we use initialNavigation: 'enabledBlocking', pages can appear to be loaded before some functionality is fully active.
In some cases this trips up Cypress, and it tries to interact with the app too soon.

We address this by introducing a new dsBrowserOnly pipe in order to defer the data-test attributes Cypress relies on to CSR.

src/app/shared/shared.module.ts

@@ -173,7 +173,7 @@ import { DsSelectComponent } from './ds-select/ds-select.component';
 import { LogInOidcComponent } from './log-in/methods/oidc/log-in-oidc.component';
 import { ThemedItemListPreviewComponent } from './object-list/my-dspace-result-list-element/item-list-preview/themed-item-list-preview.component';
 import { ExternalLinkMenuItemComponent } from './menu/menu-item/external-link-menu-item.component';
-
+import { BrowserOnlyPipe } from './utils/browser-only.pipe';
 const MODULES = [
   // Do NOT include UniversalModule, HttpModule, or JsonpModule here
   CommonModule,
@@ -215,7 +215,8 @@ const PIPES = [
   ObjectKeysPipe,
   ObjectValuesPipe,
   ConsolePipe,
-  ObjNgFor
+  ObjNgFor,
+  BrowserOnlyPipe,
 ];
 
 const COMPONENTS = [