fix(operator): update integration test for shard backup retention defaults

Signed-off-by: Veronica Lopez <veronica.lopez@supabase.io>

Author: Verolop

pkg/cluster-handler/controller/multigrescluster/integration_test.go

@@ -1276,6 +1276,10 @@ func TestMultigresCluster_HappyPath(t *testing.T) {
 								Backup: &multigresv1alpha1.BackupConfig{
 									Type:       multigresv1alpha1.BackupTypeFilesystem,
 									Filesystem: &multigresv1alpha1.FilesystemBackupConfig{Path: resolver.DefaultBackupPath, Storage: multigresv1alpha1.StorageSpec{Size: resolver.DefaultBackupStorageSize}},
+									Retention: &multigresv1alpha1.RetentionPolicy{
+										FullCount:         ptr.To(int32(4)),
+										DifferentialCount: ptr.To(int32(1)),
+									},
 								},
 							},
 						},