cp(tapd): cherrypick #4913 to v0.16 for hexun (#4920)

diff --git a/backend/plugins/tapd/models/migrationscripts/register.go b/backend/plugins/tapd/models/migrationscripts/register.go
index 6af561d..346aa9c 100644
--- a/backend/plugins/tapd/models/migrationscripts/register.go
+++ b/backend/plugins/tapd/models/migrationscripts/register.go
@@ -26,8 +26,6 @@
 	return []plugin.MigrationScript{
 		new(addInitTables),
 		new(encodeConnToken),
-		new(addTransformation),
-		new(deleteIssue),
 		new(modifyCustomFieldName),
 		new(addCustomFieldValue),
 	}