Unable to delete a specific version of a pipeline template

[sagar1312]

What happened: API /pipeline/templates/{templateNamespace}/{templateName}/versions/{version} to delete a specific version of a pipeline template fails with the below errot

{
    "statusCode": 500,
    "error": "Internal Server Error",
    "message": "templateVersion.remove is not a function"
}

What you expected to happen: API should delete the version and associated tags and return HTTP status 204

How to reproduce it: