Upgrading v1.15.x to Go 1.23 #1435

Job	Run time
Prepare Environment	15s
Prepare Environment	15s
k8s regression tests (gateway)	13m 59s
k8s regression tests (gateway)	13m 59s
k8s regression tests (gloo)	10m 18s
k8s regression tests (gloo)	9m 53s
k8s regression tests (ingress)	10m 38s
k8s regression tests (ingress)	10m 38s
k8s regression tests (helm)	27m 44s
k8s regression tests (helm)	27m 44s
k8s regression tests (gloomtls)	9m 4s
k8s regression tests (gloomtls)	9m 4s
k8s regression tests (glooctl)	14m 5s
k8s regression tests (glooctl)	14m 5s
k8s regression tests (istio)	10m 40s
k8s regression tests (istio)	10m 40s
k8s regression tests (upgrade)	32m 39s
k8s regression tests (upgrade)	32m 39s
	4h 18m 19s

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