Fix aborted transaction on duplicate cookie pattern insert

Use InsertIfNotExists instead of Insert with error check, since
a unique-violation aborts the PostgreSQL transaction even when caught.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/cookiebanner/service.go

@@ -2640,12 +2640,13 @@ func (s *Service) ReportDetectedCookies(
 						CreatedAt:        now,
 						UpdatedAt:        now,
 					}
-					if err := newPattern.Insert(ctx, tx, scope); err != nil {
-						if errors.Is(err, coredata.ErrResourceAlreadyExists) {
-							continue
-						}
+					wasInserted, err := newPattern.InsertIfNotExists(ctx, tx, scope)
+					if err != nil {
 						return fmt.Errorf("cannot insert cookie pattern: %w", err)
 					}
+					if !wasInserted {
+						continue
+					}
 					patternID = newPattern.ID
 					inserted++
 				}