chore(generator): move get_client_cert_source to compat layer - #17996

chore(generator): move get_client_cert_source to compat layer#17996

hebaalazzeh wants to merge 3 commits into

maingoogleapis/google-cloud-python:mainfrom

chore/move-get-client-cert-sourcegoogleapis/google-cloud-python:chore/move-get-client-cert-sourceCopy head branch name to clipboard