cgroupv2: Update basic-v2 test samples to pass integration

Author: ehashman

cmd/metrics-node-sampler/integration/testdata/basic-v2/expected.json

@@ -156,9 +156,11 @@
 			{
 				"aggregationLevel": "max.slice",
 				"cpuCoresNanoSec": [
+					"2000000",
 					"2000000"
 				],
 				"memoryBytes": [
+					"0",
 					"0"
 				],
 				"avgCPUCoresNanoSec": "2000000",
@@ -167,12 +169,20 @@
 			{
 				"aggregationLevel": "min.slice",
 				"cpuCoresNanoSec": [
+					"0",
+					"0",
+					"0",
+					"1000000",
 					"1000000"
 				],
 				"memoryBytes": [
+					"0",
+					"0",
+					"0",
+					"0",
 					"0"
 				],
-				"avgCPUCoresNanoSec": "1000000",
+				"avgCPUCoresNanoSec": "400000",
 				"avgMemoryBytes": "0"
 			},
 			{