test: prove externally-managed control-plane join end to end (#4099-5… #34

Job	Run time
resolve supported version window	4s
build / vet / test / lint	32s
e2e (k8s 1.34)	20m 34s
e2e (k8s 1.36)	20m 31s
image build (k8s 1.35)	3m 28s
image build (k8s 1.34)	3m 10s
e2e (k8s 1.35)	20m 45s
image build (k8s 1.36)	3m 13s
	1h 12m 17s

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