chore(node): exclude test fixtures from post-processing#8173

gcf-owl-bot[bot] wants to merge 1 commit intomaingoogleapis/google-cloud-node:mainfrom

owl-bot-update-lock-715766c3cc3c9cee22792364d83af4b7357f36428cddc9b41ae0bc5e95fd59b1googleapis/google-cloud-node:owl-bot-update-lock-715766c3cc3c9cee22792364d83af4b7357f36428cddc9b41ae0bc5e95fd59b1Copy head branch name to clipboard