chore(python): remove obsolete release scripts and config files#755

parthea merged 2 commits intomaingoogleapis/python-api-core:mainfrom

owl-bot-update-lock-91d0075c6f2fd6a073a06168feee19fa2a8507692f2519a1dc7de3366d157e99googleapis/python-api-core:owl-bot-update-lock-91d0075c6f2fd6a073a06168feee19fa2a8507692f2519a1dc7de3366d157e99Copy head branch name to clipboard