chore(php): [Many APIs] remove "no check-in" protobuf header#8997

bshaffer merged 5 commits intomaingoogleapis/google-cloud-php:mainfrom

owl-bot-copy-e02e31c0300549c91c64googleapis/google-cloud-php:owl-bot-copy-e02e31c0300549c91c64Copy head branch name to clipboard