If the github action has more than a certain amount of commits, split it up

[sofisl]

see this action failing: https://github.com/googleapis/google-api-nodejs-client/pull/3697/checks?check_run_id=44878069536

and this PR: https://github.com/googleapis/google-api-nodejs-client/pull/3697

if we get backed up for some reason (since the action was failing), make sure to create multiple PRs

cc @miguelvelezsa