[agent] use root_path #1536

Job	Run time
kubernetes-test (v1.30.0, functional)	2m 44s
kubernetes-test (v1.30.0, histogram)	3m 26s
kubernetes-test (v1.29.0, functional)	2m 32s
kubernetes-test (v1.29.0, histogram)	5m 44s
kubernetes-test (v1.28.0, functional)	2m 20s
kubernetes-test (v1.28.0, histogram)	3m 29s
kubernetes-test (v1.27.3, functional)	2m 23s
kubernetes-test (v1.27.3, histogram)	3m 30s
kubernetes-test (v1.26.6, functional)	2m 26s
kubernetes-test (v1.26.6, histogram)	3m 31s
kubernetes-test (v1.25.11, functional)	2m 30s
kubernetes-test (v1.25.11, histogram)	3m 30s
Test helm upgrade in GKE/Autopilot - credentials needed	0s
Test helm install in EKS - credentials needed	0s
Test helm install in GKE/Autopilot - credentials needed	0s
Test helm install in AKS - credentials needed	0s
Test helm upgrade in EKS - credentials needed	0s
	38m 5s

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