Performance: Enable virtual scrolling for large custom field selects (#10708)

src-ui/src/app/components/common/custom-fields-query-dropdown/custom-fields-query-dropdown.component.html

@@ -51,6 +51,7 @@
     <ng-select #fieldSelects
       class="paperless-input-select rounded-end"
       [items]="getSelectOptionsForField(atom.field)"
+      [virtualScroll]="getSelectOptionsForField(atom.field)?.length > 100"
       bindLabel="label"
       bindValue="id"
       [(ngModel)]="atom.value"