chore(python): remove obsolete release scripts and config files (#755) * chore(python): remove obsolete release scripts and config files Source-Link: https://github.com/googleapis/synthtool/commit/635751753776b1a7cabd4dcaa48013a96274372d Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:91d0075c6f2fd6a073a06168feee19fa2a8507692f2519a1dc7de3366d157e99 * See https://github.com/googleapis/synthtool/pull/2035 --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com> Co-authored-by: Anthonios Partheniou <[email protected]>