ci: add pylint presubmit on golden files (closes #16393)#16808

MukundaKatta wants to merge 3 commits intogoogleapis:maingoogleapis/google-cloud-python:mainfrom

MukundaKatta:ci/pylint-presubmit-goldensMukundaKatta/google-cloud-python:ci/pylint-presubmit-goldensCopy head branch name to clipboard