cft: promote new_builders to stable

as per crrev.com/c/3631023, promoting these to stable, as they built for
~3 days without issues.

BUG=b:230875828
TEST=unittest. (see any builder for stability proof)

Change-Id: Ia61eff7d8f4abe97dc5ae48a7a70c63c9527ab64
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3635007
Reviewed-by: Seewai Fu <seewaifu@google.com>
Commit-Queue: Derek Beckett <dbeckett@chromium.org>
Tested-by: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
diff --git a/api/controller/test_unittest.py b/api/controller/test_unittest.py
index 37174c1..2138370 100644
--- a/api/controller/test_unittest.py
+++ b/api/controller/test_unittest.py
@@ -416,10 +416,7 @@
         self.api_config)
     patch.assert_called()
     for result in response.results:
-      if 'beta' in result.name:
-        self.assertEqual(result.WhichOneof('result'), 'success')
-      else:
-        self.assertEqual(result.WhichOneof('result'), 'failure')
+      self.assertEqual(result.WhichOneof('result'), 'failure')
 
 class ChromiteUnitTestTest(cros_test_lib.MockTestCase,
                            api_config.ApiConfigMixin):