Fix breaking changes in non-core repos #762
                
     Merged
            
            
          
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Commit e6f817c introduced a breaking change when downloading the GPG key from non-core repos on SLES.
It also incorrectly attempted to manage credentials for non-core repos for all rpm-based platforms.
This commit restores the GPG location on yum.puppet.com and guards the sed commands to only run when the repo collection contains "core"
This should fix https://jenkins-platform.delivery.puppetlabs.net/view/puppet-agent/view/Acceptance%20Suites/view/CI%20Goalie/job/forge-module_puppetlabs-puppet-agent-module_intn-run_task_acceptance-main/591/