[skip-ci] Packit: enable c10s downstream sync

[lsm5]

This commit will enable downstream syncing to CentOS Stream 10. The centos maintainer will need to manually run packit propose-downstream and centpkg build until better centos integration is in place.

This commit also builds both rhel and centos stream copr rpms so we can check for things like differences in python toolchain.

EL8 jobs have also been deleted. CentOS Stream 8 will go EOL soon. We won't be shipping anything from main into EL8.

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[lsm5]

@inknos PTAL

cc @TomSweeneyRedHat @jwhonce @umohnani8

[jwhonce]

LGTM, I don't see any problems but also I do not know packit

[TomSweeneyRedHat]

LGTM

[lsm5]

@inknos PTAL. Previous comment addressed.

[inknos]

/lgtm

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[inknos]

/lgtm