fix: restore displaced TODO comment, add GHES edit relationship test

- Restore // TODO projectsV1Deprecation comment above
  TestProjectsV1Deprecation (was displaced when new tests were
  inserted at that location)
- Add 'relationships unsupported on GHES' test case to edit command
  using DisabledDetectorMock (parity with create's GHES tests)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pkg/cmd/issue/create/create_test.go

@@ -1260,8 +1260,6 @@ func TestIssueCreate_projectsV2(t *testing.T) {
 	assert.Equal(t, "https://github.com/OWNER/REPO/issues/12\n", output.String())
 }
 
-// TODO projectsV1Deprecation
-// Remove this test.
 func TestNewCmdCreate_issuesV2Flags(t *testing.T) {
 	tests := []struct {
 		name          string
@@ -1604,6 +1602,8 @@ func Test_createRun_issuesV2(t *testing.T) {
 	}
 }
 
+// TODO projectsV1Deprecation
+// Remove this test.
 func TestProjectsV1Deprecation(t *testing.T) {
 
 	t.Run("non-interactive submission", func(t *testing.T) {

pkg/cmd/issue/edit/edit_test.go

@@ -1136,6 +1136,22 @@ func Test_editRun(t *testing.T) {
 			},
 			stdout: "https://github.com/OWNER/REPO/issue/123\n",
 		},
+		{
+			name: "relationships unsupported on GHES",
+			input: &EditOptions{
+				Detector:     &fd.DisabledDetectorMock{},
+				IssueNumbers: []int{123},
+				Interactive:  false,
+				AddBlockedBy: []string{"200"},
+				FetchOptions: func(_ *api.Client, _ ghrepo.Interface, _ *prShared.Editable, _ gh.ProjectsV1Support) error {
+					return nil
+				},
+			},
+			httpStubs: func(t *testing.T, reg *httpmock.Registry) {
+				mockIssueGet(t, reg)
+			},
+			wantErr: true,
+		},
 		{
 			name: "batch edit type",
 			input: &EditOptions{