feat: OnDeleteCatalog (#10)

* feat: OnDeleteCatalog

Delete managed creds (creds we rotated previously) when a host catalog is deleted

internal/credential/rotate.go

@@ -143,7 +143,7 @@ func (c *Config) DeletePrivateKey(ctx context.Context, opts ...option.ClientOpti
 		Name: fmt.Sprintf("projects/-/serviceAccounts/%s/keys/%s", c.ClientEmail, c.PrivateKeyId),
 	})
 	if err != nil {
-		return status.Errorf(codes.Internal, "error deleting service account key: %v", err)
+		return status.Errorf(codes.Unknown, "error deleting service account key: %v", err)
 	}
 
 	return nil

internal/credential/rotate_test.go

@@ -317,7 +317,7 @@ func TestDeletePrivateKey(t *testing.T) {
 			setup: func() {
 				testIAMAdminServer.testDeleteServiceAccountKeyError = errors.New("delete key error")
 			},
-			expectedError: status.Errorf(codes.Internal, "error deleting service account key"),
+			expectedError: status.Errorf(codes.Unknown, "error deleting service account key"),
 		},
 		{
 			name: "Successful deletion",