Add log schema for PersistentVolume and PersistentVolumeClaim to fix integ test failure

[yanhaoluo666]

Description of the issue

Integ test started to fail after adding PersistentVolumeClaim metrics(PR), the error is

null_resource.validator (local-exec): 2025/10/23 16:20:25 log validation (/aws/containerinsights/cwagent-eks-integ-6e20591cb222c63d/performance/ip-172-31-63-216.us-west-2.compute.internal) failed: unable to retrieve schema: invalid type provided: PersistentVolume
null_resource.validator (local-exec): 2025/10/23 16:20:25 EKS_GPU_NVIDIA test group failed
null_resource.validator (local-exec):     gpu_test.go:70:
null_resource.validator (local-exec):         	Error Trace:	/home/runner/work/amazon-cloudwatch-agent/amazon-cloudwatch-agent/test/gpu/gpu_test.go:70
null_resource.validator (local-exec):         	Error:      	Not equal:
null_resource.validator (local-exec):         	            	expected: "Successful"
null_resource.validator (local-exec):         	            	actual  : "Failed"

null_resource.validator (local-exec):         	            	Diff:
null_resource.validator (local-exec):         	            	--- Expected
null_resource.validator (local-exec):         	            	+++ Actual
null_resource.validator (local-exec):         	            	@@ -1,2 +1,2 @@
null_resource.validator (local-exec):         	            	-(status.TestStatus) (len=10) "Successful"
null_resource.validator (local-exec):         	            	+(status.TestStatus) (len=6) "Failed"

null_resource.validator (local-exec):         	Test:       	TestGPUSuite/TestAllInSuite
null_resource.validator (local-exec):         	Messages:   	GPU Container Test Suite Failed

Description of changes

Add log schema for PersistentVolumeClaim and PersistentVolume to validate in test/metric_value_benchmark/eks_resources/util.go .

License

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Tests

deployed to personal branch and tested with new changes in https://github.com/aws/amazon-cloudwatch-agent/actions/runs/17095508952/job/48478961695#step:7:2569