Fix MM-42270 (#19692)

* [MM-42270] - Fix MM-42270

* clean test code

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/system_test.go

@@ -208,6 +208,20 @@ func TestGenerateSupportPacket(t *testing.T) {
 		require.NotZero(t, len(file))
 	})
 
+	t.Run("As a System Administrator but with RestrictSystemAdmin true", func(t *testing.T) {
+		originalRestrictSystemAdminVal := *th.App.Config().ExperimentalSettings.RestrictSystemAdmin
+		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ExperimentalSettings.RestrictSystemAdmin = true })
+		defer func() {
+			th.App.UpdateConfig(func(cfg *model.Config) {
+				*cfg.ExperimentalSettings.RestrictSystemAdmin = originalRestrictSystemAdminVal
+			})
+		}()
+
+		_, resp, err := th.SystemAdminClient.GenerateSupportPacket()
+		require.Error(t, err)
+		CheckForbiddenStatus(t, resp)
+	})
+
 	t.Run("As a Regular User", func(t *testing.T) {
 		_, resp, err := th.Client.GenerateSupportPacket()
 		require.Error(t, err)