Bump helm/chart-testing-action from 2.6.1 to 2.7.0 (#1623) #1992

Job	Run time
kubernetes-test (v1.30.0, functional)	5m 38s
kubernetes-test (v1.30.0, histogram)	3m 35s
kubernetes-test (v1.30.0, configuration_switching)	7m 46s
kubernetes-test (v1.29.0, functional)	13m 2s
kubernetes-test (v1.29.0, histogram)	4m 28s
kubernetes-test (v1.29.0, configuration_switching)	7m 45s
kubernetes-test (v1.28.0, functional)	5m 12s
kubernetes-test (v1.28.0, histogram)	3m 33s
kubernetes-test (v1.28.0, configuration_switching)	7m 46s
kubernetes-test (v1.27.3, functional)	5m 47s
kubernetes-test (v1.27.3, histogram)	3m 53s
kubernetes-test (v1.27.3, configuration_switching)	8m 19s
kubernetes-test (v1.26.6, functional)	5m 10s
kubernetes-test (v1.26.6, histogram)	3m 52s
kubernetes-test (v1.26.6, configuration_switching)	8m 15s
kubernetes-test (v1.25.11, functional)	5m 41s
kubernetes-test (v1.25.11, histogram)	3m 54s
kubernetes-test (v1.25.11, configuration_switching)	8m 14s
Test helm install in EKS - credentials needed	0s
Test helm upgrade from release in EKS - credentials needed	0s
Test helm install in GKE/Autopilot - credentials needed	0s
Test helm upgrade in EKS - credentials needed	0s
Test helm install in AKS - credentials needed	0s
Test helm install in GCE (kops) - credentials needed	0s
Test helm upgrade in GKE/Autopilot - credentials needed	0s
	1h 51m 50s

Provide feedback