Merge PR #66294 into wip-pdonnell-testing-20260414.011750

* refs/pull/66294/head:
	qa: rename distro
	qa/suites/fs/bugs: use centos9 for squid upgrade test
	qa: remove unused variables
	qa: use centos9 for fs suites using k-testing
	qa: update fs suite to rocky10
	qa: skip dashboard install due to dependency noise
	qa: only setup nat rules during bridge creation
	qa: correct wording of comment
	qa: use nft instead iptables
	qa: use py3 builtin ipaddress module