Remove dead python2 references

[mboersma]

Change description

Cleanup of dead python2 references that target RHEL/CentOS 7 and 8 — neither of which are build targets in image-builder anymore (the README only lists rhel-9, rockylinux-9, almalinux-9, centos-9, and Makefile has no *-7/*-8 entries).

Removes:

• roles/providers/tasks/vmware-redhat.yml: the Install python2 pip task (gated on distribution_major_version <= 8) and the Upgrade pip task (gated on == 7). Both conditions are now unreachable.
• packer/goss/goss-vars.yaml: four python2-pip: entries (two ungated under centos:, two under distro_version: "8" blocks).

make lint passes cleanly.

• Is this change including a new Provider or a new OS? (y/n) n

Related issues

• Closes Remove python2 from CAPI Photon images #578 (no longer applicable — Photon 3 has been removed entirely; current Photon 4/5 paths already use python3 only — but this PR cleans up the unrelated python2 cruft that lingered elsewhere)

Additional context

No behavior change for any currently-built distro. Easy revert if desired.

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Test name	Commit	Details	Required	Rerun command
pull-ova-all	7e4c97c	link	false	/test pull-ova-all

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