Remove slirp for Podman6

[lsm5]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

For podman6

How to verify it

Verify buildah doesn't work with slirp

Which issue(s) this PR fixes:

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

Slirp4netns support has been removed.

Rebased on the cgroups v1 removal PR.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lsm5

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[packit-as-a-service]

Ephemeral COPR build failed. @containers/packit-build please check.

[nalind]

Does this include the changes from #6424?

[lsm5]

Does this include the changes from #6424?

I think so. I might need to rebase on main though. Also, one of the crun tests timed out. I retriggered it just now.

[openshift-merge-robot]

PR needs rebase.

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[TomSweeneyRedHat]

@lsm needs rebasing

[lsm5]

@lsm needs rebasing

@TomSweeneyRedHat lsm is someone else (and he liked the comment 😄) . Might wanna wait for the suggestions when you start @-ing

[TomSweeneyRedHat]

@lsm5 I can not be held legally responsible for anything that I type before 9:00 in the morning or after 5:00 in the afternoon my time.

@lsm, apologies for the noise!

[github-actions]

A friendly reminder that this PR had no activity for 30 days.