Fix async id prefix (#535)

It fixes these errors:

<img width="2181" alt="Screenshot 2024-07-15 at 19 27 49"
src="https://github.com/user-attachments/assets/01bb3d97-2ffa-4440-ae13-039c0f3f6a62">

quesma/quesma/search.go

@@ -394,7 +394,7 @@ func (q *QueryRunner) asyncQueriesCumulatedBodySize() int {
 }
 
 func (q *QueryRunner) handlePartialAsyncSearch(ctx context.Context, id string) ([]byte, error) {
-	if !strings.Contains(id, "quesma_async_search_id_") {
+	if !strings.Contains(id, tracing.AsyncIdPrefix) {
 		logger.ErrorWithCtx(ctx).Msgf("non quesma async id: %v", id)
 		return queryparser.EmptyAsyncSearchResponse(id, false, 503)
 	}
@@ -429,7 +429,7 @@ func (q *QueryRunner) handlePartialAsyncSearch(ctx context.Context, id string) (
 }
 
 func (q *QueryRunner) deleteAsyncSeach(id string) ([]byte, error) {
-	if !strings.Contains(id, "quesma_async_search_id_") {
+	if !strings.Contains(id, tracing.AsyncIdPrefix) {
 		return nil, errors.New("invalid quesma async search id : " + id)
 	}
 	q.AsyncRequestStorage.Delete(id)