Merge PR #66294 into wip-pdonnell-testing-20260414.012725

* refs/pull/66294/head:
	qa: enforce centos9 for test
	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
	Merge pull request #68167 from smanjara/wip-fix-75465
	Merge pull request #67253 from VinayakTiwari1103/osd-fix-build-incremental-map-msg-abort
	osd: avoid ceph_abort in build_incremental_map_msg when newest_map is missing
	qa/multisite: fix test_bucket_remove false failure on bucket deletion check