refactor: Remove unused test helper function (nutanix-cloud-native#647)

**What problem does this PR solve?**:
Removes unused test helper function.

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Author: dlipovetsky

common/pkg/testutils/capitest/patches.go

@@ -38,62 +38,6 @@ type JSONPatchMatcher struct {
 	ValueMatcher gomegatypes.GomegaMatcher
 }
 
-func ValidateGeneratePatches[T mutation.GeneratePatches](
-	t GinkgoTInterface,
-	handlerCreator func() T,
-	testDefs ...PatchTestDef,
-) {
-	t.Helper()
-	testFunc := func(tt *PatchTestDef) {
-		g := gomega.NewWithT(t)
-		h := handlerCreator()
-		req := &runtimehooksv1.GeneratePatchesRequest{
-			Variables: tt.Vars,
-			Items: []runtimehooksv1.GeneratePatchesRequestItem{
-				tt.RequestItem,
-				{
-					HolderReference: runtimehooksv1.HolderReference{
-						APIVersion: clusterv1.GroupVersion.String(),
-						Kind:       "Cluster",
-						Namespace:  request.Namespace,
-						Name:       request.ClusterName,
-					},
-				},
-			},
-		}
-		resp := &runtimehooksv1.GeneratePatchesResponse{}
-		h.GeneratePatches(context.Background(), req, resp)
-		expectedStatus := runtimehooksv1.ResponseStatusSuccess
-		if tt.ExpectedFailure {
-			expectedStatus = runtimehooksv1.ResponseStatusFailure
-		}
-		g.Expect(resp.Status).
-			To(gomega.Equal(expectedStatus), fmt.Sprintf("Message: %s", resp.Message))
-
-		if len(tt.ExpectedPatchMatchers) == 0 {
-			g.Expect(resp.Items).To(gomega.BeEmpty())
-			return
-		}
-		g.Expect(resp.Items).To(containPatches(&tt.RequestItem, tt.ExpectedPatchMatchers...))
-
-		if len(tt.UnexpectedPatchMatchers) > 0 {
-			g.Expect(resp.Items).
-				ToNot(containPatches(&tt.RequestItem, tt.UnexpectedPatchMatchers...))
-		}
-	}
-
-	// compose Ginkgo table arguments
-	// https://onsi.github.io/ginkgo/#table-specs for more details
-	testArgs := make([]TableEntry, 0, len(testDefs))
-	for testIdx := range testDefs {
-		tt := testDefs[testIdx]
-		testArgs = append(testArgs, Entry(tt.Name, &tt))
-	}
-	DescribeTable("Patches", testFunc, testArgs)
-}
-
-// TODO(shalinpatel): AssertGeneratePatches is a replacement of ValidateGeneratePatches function.
-// remove ValidateGeneratePatches once all the shared test cases are moved to their own patch package.
 func AssertGeneratePatches[T mutation.GeneratePatches](
 	t GinkgoTInterface,
 	handlerCreator func() T,