Allow to delete deployments via API

Release notes

In 15.3, we are adding the ability to delete deployments via API. This allows you to manage and clean up old deployments refs.

Problem

Currently, we don't support delete deployments via API. This API could be useful to clean up old deployment refs that likely users will never use for re-deploy/rollback.

See &5920 (comment 633731178) for more information.

Proposal

Support delete deployments via API