ci: skip flaky test (#15308)

## Description

This change skips the test accounting for half of all test retries in
the last seven days.

## Testing

It will be important to understand why this test is failing and retrying
so frequently, and re-enable it at that time.

Author: emmettbutler

tests/tracer/runtime/test_runtime_metrics.py

@@ -147,6 +147,7 @@ def test_one_metric(self):
 
 
 class TestRuntimeWorker(TracerTestCase):
+    @pytest.mark.skip(reason="Very frequently retried")
     def test_tracer_metrics(self):
         # Mock socket.socket to hijack the dogstatsd socket
         with mock.patch("socket.socket") as sock: