Fixes #31306 - fetch pxe files after SP sync

[jlsherrill]

Currently the FetchPxeFiles action is scheduled
concurrently with the Smart Proxy sync action.
This results in 404s upon initial sync. This
schedules them sequentually to occur after the sync

[theforeman-bot]

Issues: #31306

[jlsherrill]

[test katello]

[jlsherrill]

Also i meant to mention, to reproduce:

1. sync some kickstart repo
2. add a smart proxy, add some LCE to it
3. publish the kickstart repo to a CV and publish it to the same LCE
4. watch the capsule sync
5. example the apache access logs on the smart proxy, grep them for vmlinuz and initrd
6. without this patch you'll notice a 404 for both requests

[jlsherrill]

[test katello]

[jlsherrill]

[test katello]

[jturel]

Wow, I totally ACK'd and shared the output I found before the holiday. I must have neglected to hit Submit. This works great. Sorry about that!

[jturel]

ACK