Default to K8s 1.28 in e2e #569

Job	Run time
Clean up generated files	1m 10s
Images	1m 56s
Build multi-arch images	2m 30s
Clusters	1m 33s
Clean up clusters	1m 57s
Compilation	41s
Deployment (operator)	2m 37s
E2E	3m 5s
Multiple gateways support	1m 30s
Deployment (helm)	2m 13s
Post mortem	2m 1s
Deployment (globalnet, operator)	2m 33s
Unit tests	1m 30s
Deployment (globalnet, helm)	2m 29s
Deployment (air-gap)	3m 4s
Deployment (air-gap, globalnet)	2m 59s
Deployment (air-gap, lighthouse)	3m 5s
Deployment (air-gap, ovn)	6m 20s
Deployment (dual-stack)	3m 9s
Deployment (ovn)	5m 48s
Deployment (ovn-ic)	6m 28s
Deployment (operator, lighthouse)	2m 31s
Deployment (helm, lighthouse)	2m 10s
Deployment (load-balancer)	3m 2s
Deployment (prometheus)	2m 36s
	1h 8m 57s

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