OZG-4179 OZG-4710 Fix Clear search string in state

- Do not clear search string when clearing preview list
- CLear search field needs time to emit "clear" event

alfa-client/libs/vorgang-shared-ui/src/lib/vorgang-search-container/vorgang-search/vorgang-search.formservice.ts

@@ -68,8 +68,8 @@ export class VorgangSearchFormService implements OnDestroy {
 
 	subscribeToValueChanges(): void {
 		this.fromControlSubscription = this.getSearchFormControl().valueChanges.pipe(
-			tap(value => this.setHasSearchString(value)),
 			debounceTime(300),
+			tap(value => this.setHasSearchString(value)),
 			distinctUntilChanged()
 		).subscribe(value => this.handleValueChanges(value));
 	}

alfa-client/libs/vorgang-shared/src/lib/vorgang-list.service.ts

@@ -95,7 +95,6 @@ export class VorgangListService {
 	}
 
 	public clearSearchPreviewList(): void {
-		this.vorgangFacade.clearSearchString();
 		this.vorgangFacade.clearSearchPreviewList();
 	}