DRA: remove "source" indirection from v1 Pod API

This makes the API nicer:

    resourceClaims:
    - name: with-template
      resourceClaimTemplateName: test-inline-claim-template
    - name: with-claim
      resourceClaimName: test-shared-claim

Previously, this was:

    resourceClaims:
    - name: with-template
      source:
        resourceClaimTemplateName: test-inline-claim-template
    - name: with-claim
      source:
        resourceClaimName: test-shared-claim

A more long-term benefit is that other, future alternatives
might not make sense under the "source" umbrella.

This is a breaking change. It's justified because DRA is still
alpha and will have several other API breaks in 1.31.

test/integration/auth/node_test.go

@@ -225,8 +225,8 @@ func TestNodeAuthorizer(t *testing.T) {
 						{Name: "pvc", VolumeSource: corev1.VolumeSource{PersistentVolumeClaim: &corev1.PersistentVolumeClaimVolumeSource{ClaimName: "mypvc"}}},
 					},
 					ResourceClaims: []corev1.PodResourceClaim{
-						{Name: "namedclaim", Source: corev1.ClaimSource{ResourceClaimName: pointer.String("mynamedresourceclaim")}},
-						{Name: "templateclaim", Source: corev1.ClaimSource{ResourceClaimTemplateName: pointer.String("myresourceclaimtemplate")}},
+						{Name: "namedclaim", ResourceClaimName: pointer.String("mynamedresourceclaim")},
+						{Name: "templateclaim", ResourceClaimTemplateName: pointer.String("myresourceclaimtemplate")},
 					},
 				},
 			}, metav1.CreateOptions{})

test/integration/scheduler/scheduler_test.go

@@ -714,7 +714,7 @@ func TestPodSchedulingContextSSA(t *testing.T) {
 	pod := testutils.InitPausePod(&podConf)
 	podClaimName := "myclaim"
 	pod.Spec.Containers[0].Resources.Claims = []v1.ResourceClaim{{Name: podClaimName}}
-	pod.Spec.ResourceClaims = []v1.PodResourceClaim{{Name: podClaimName, Source: v1.ClaimSource{ResourceClaimName: &claim.Name}}}
+	pod.Spec.ResourceClaims = []v1.PodResourceClaim{{Name: podClaimName, ResourceClaimName: &claim.Name}}
 	if _, err := testCtx.ClientSet.CoreV1().Pods(pod.Namespace).Create(testCtx.Ctx, pod, metav1.CreateOptions{}); err != nil {
 		t.Fatalf("Failed to create pod: %v", err)
 	}

test/integration/scheduler_perf/config/dra/pod-with-claim-ref.yaml

@@ -11,6 +11,5 @@ spec:
       - name: resource
   resourceClaims:
   - name: resource
-    source:
-      # Five pods share access to the same claim.
-      resourceClaimName: test-claim-{{div .Index 5}}
+    # Five pods share access to the same claim.
+    resourceClaimName: test-claim-{{div .Index 5}}

test/integration/scheduler_perf/config/dra/pod-with-claim-template.yaml

@@ -11,5 +11,4 @@ spec:
       - name: resource
   resourceClaims:
   - name: resource
-    source:
-      resourceClaimTemplateName: test-claim-template
+    resourceClaimTemplateName: test-claim-template

test/integration/scheduler_perf/config/dra/pod-with-many-claim-templates.yaml

@@ -14,14 +14,10 @@ spec:
       - name: resource-2b
   resourceClaims:
   - name: resource-1a
-    source:
-      resourceClaimTemplateName: test-claim-template
+    resourceClaimTemplateName: test-claim-template
   - name: resource-1b
-    source:
-      resourceClaimTemplateName: test-claim-template
+    resourceClaimTemplateName: test-claim-template
   - name: resource-2a
-    source:
-      resourceClaimTemplateName: another-test-claim-template
+    resourceClaimTemplateName: another-test-claim-template
   - name: resource-2b
-    source:
-      resourceClaimTemplateName: another-test-claim-template
+    resourceClaimTemplateName: another-test-claim-template