Remove pulp oauth support
https://github.com/Katello/katello-installer/pull/572, https://github.com/theforeman/puppet-pulp/pull/286, https://github.com/theforeman/puppet-foreman_proxy_content/pull/151, https://github.com/theforeman/puppet-katello/pull/223, https://github.com/Katello/katello-installer/pull/560, https://github.com/Katello/katello/pull/7031
Pulp has deprecated oauth, it hasn't been the default in Katello for a while now. Lets remove it.
Refs #21464 - Remove old CP oauth param
Candlepin oauth params are now prefixed with `candlepin_`