Fix incorrect field names in nodeResources example files (#1917)

The nodeResources filter examples incorrectly used `allocatableMemory`
instead of `memoryAllocatable`. This causes YAML parsing to silently
ignore the field, resulting in empty filter values and unexpected
analyzer behavior.

Changed in 3 files (5 instances total):
- examples/preflight/node-resources.yaml (3 instances)
- examples/preflight/e2e.yaml (1 instance)
- examples/support-bundle/e2e.yaml (1 instance)

The correct field names according to pkg/apis/troubleshoot/v1beta2/analyzer_shared.go
are:
- memoryAllocatable (not allocatableMemory)
- cpuAllocatable (not allocatableCPU)
- memoryCapacity (not capacityMemory)
- cpuCapacity (not capacityCPU)

This bug caused users copying from these examples to experience false
failures in preflight checks, as documented in the bug report where
a GKE cluster with 85Gi memory failed a check requiring only 8Gi.

examples/preflight/e2e.yaml

@@ -92,7 +92,7 @@ spec:
     - nodeResources:
         checkName: Must have 1 node with 2Gi (available) memory and at least 2 cores (on a single node)
         filters:
-          allocatableMemory: 2Gi
+          memoryAllocatable: 2Gi
           cpuCapacity: "2"
         outcomes:
           - pass:

examples/preflight/node-resources.yaml

@@ -28,7 +28,7 @@ spec:
     - nodeResources:
         checkName: Must have 1 node with 16 GB (available) memory and 10 cores (on a single node)
         filters:
-          allocatableMemory: 16Gi
+          memoryAllocatable: 16Gi
           cpuCapacity: "10"
         outcomes:
           - fail:
@@ -39,7 +39,7 @@ spec:
     - nodeResources:
         checkName: Must have 1 node with 16 GB (available) memory and 4 cores of amd64 arch (on a single node)
         filters:
-          allocatableMemory: 16Gi
+          memoryAllocatable: 16Gi
           cpuArchitecture: amd64
           cpuCapacity: "4"
         outcomes:
@@ -54,7 +54,7 @@ spec:
           selector:
             matchLabel:
               node-role.kubernetes.io/master: ""
-          allocatableMemory: 16Gi
+          memoryAllocatable: 16Gi
           cpuArchitecture: amd64
           cpuCapacity: "6"
         outcomes:

examples/support-bundle/e2e.yaml

@@ -77,7 +77,7 @@ spec:
     - nodeResources:
         checkName: Must have 1 node with 2Gi (available) memory and at least 2 cores (on a single node)
         filters:
-          allocatableMemory: 2Gi
+          memoryAllocatable: 2Gi
           cpuCapacity: "2"
         outcomes:
           - pass: