Remove the F31/F32 internal repositories since they are causing dnf
download errors from time to time.
The 8.2 repository override should have never been there in the first
place since we're using the CDN.
The 8.3 repository is no longer needed since we can register the RHEL
8.3 instances against the staging CDN and get beta content from there.
Fixes#822.
Signed-off-by: Major Hayden <major@redhat.com>