Remove old test code from backhaul tier #864

Job	Run time
kitchen / prepare-matrix	4s
kitchen / run-kitchen-tests (ubuntu-2204)	1m 46s
kitchen / run-kitchen-tests (ubuntu-2404)	2m 4s
kitchen / run-kitchen-tests (centos-stream-10)	2m 6s
kitchen / run-kitchen-tests (centos-stream-9)	2m 51s
kitchen / run-kitchen-tests (debian-12)	1m 41s
kitchen / run-kitchen-tests (fedora-40)	1m 33s
	12m 5s

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