Test for UnstructureList decode diff between strict and non-strict.

[benluddy]

What type of PR is this?

/sig api-machinery

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[benluddy]

/test pull-kubernetes-unit

make test WHAT=./staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json
+++ [0306 18:38:10] Set GOMAXPROCS automatically to 20
+++ [0306 18:38:10] Running tests without code coverage and with -race
--- FAIL: TestDecodeUnstructuredList (0.00s)
    unstructured_test.go:44: diff strict lax:
          unstructured.UnstructuredList{
          	Object: map[string]any{
          		"apiVersion": string("json.example.com/v1alpha1"),
        - 		"items":      []any{map[string]any{"spec": map[string]any{"abc": int64(123)}}},
          		"kind":       string("FooList"),
          	},
          	Items: []unstructured.Unstructured{
          		{
          			Object: map[string]any{
        + 				"apiVersion": string("json.example.com/v1alpha1"),
        + 				"kind":       string("Foo"),
          				"spec":       map[string]any{"abc": int64(123)},
          			},
          		},
          	},
          }
FAIL
FAIL	k8s.io/apimachinery/pkg/runtime/serializer/json	0.102s
FAIL

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: benluddy
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[k8s-ci-robot]

@benluddy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-unit	073b4ab	link	true	/test pull-kubernetes-unit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[deads2k]

 	0s
{Failed;  === RUN   TestDecodeUnstructuredList
    unstructured_test.go:47: diff strict lax:
          unstructured.UnstructuredList{
          	Object: map[string]any{
          		"apiVersion": string("json.example.com/v1alpha1"),
        - 		"items":      []any{map[string]any{"spec": map[string]any{"abc": int64(123)}}},
          		"kind":       string("FooList"),
          	},
          	Items: []unstructured.Unstructured{
          		{
          			Object: map[string]any{
        + 				"apiVersion": string("json.example.com/v1alpha1"),
        + 				"kind":       string("Foo"),
          				"spec":       map[string]any{"abc": int64(123)},
          			},
          		},
          	},
          }
--- FAIL: TestDecodeUnstructuredList (0.00s)
;}

Oh my.