Description of problem:

I have a custom product on this satellite:
https://repo.skype.com/rpm/stable

This has worked well for years but it appears that Skype recently switched to ztd compression for its repodata.
Even though my Satellite has the RHEL8.8 zst packages installed, this makes the repo unsyncable and an error is seen in the sync task log:

Errors:
Cannot open /var/lib/pulp/tmp/6323@sat6.lasthome.solace.krynn/tmpdfzm7dwc/tmp6vz8wmzq-44e0a07b586dafa046deee582d4d49601f6b407703f53e0353546444cec4a78b-primary.xml.zst: Cannot detect compression type

Version-Release number of selected component (if applicable):
Satellite 6.15.1 + RHEL 8.8

How reproducible:
100%, the product and its CV are no longer updating since Skype switched to zst comnpression.

Steps to Reproduce:
1. Create a skype product (yum) with a yum repo pointing to: https://repo.skype.com/rpm/stable
2. Try to sync it.
3.

Actual results:
Errors:
Cannot open /var/lib/pulp/tmp/6323@sat6.lasthome.solace.krynn/tmpdfzm7dwc/tmp6vz8wmzq-44e0a07b586dafa046deee582d4d49601f6b407703f53e0353546444cec4a78b-primary.xml.zst: Cannot detect compression type

this is even though my Sat has the rpms installed:
[root@sat6 ~]# rpm -qa pulpcore* zst satellite
satellite-6.12.5.1-1.el8sat.noarch
pulpcore-selinux-1.3.2-1.el8pc.x86_64
zstd-1.4.4-1.el8.x86_64
libzstd-1.4.4-1.el8.i686
libzstd-devel-1.4.4-1.el8.x86_64
libzstd-1.4.4-1.el8.x86_64