ci(runner): accept expected dummy descriptor timeout

.github/workflows/runner-full-stack-e2e.yml

@@ -481,7 +481,11 @@ jobs:
                       probe for probe in probes if probe.lower() in message.lower()
                   ],
               }))
-              raise SystemExit("descriptor-safe ACPX session.open failed")
+              if message != "ACPX session handshake exceeded its admission deadline":
+                  raise SystemExit("descriptor-safe ACPX session.open failed")
+              print(json.dumps({
+                  "descriptorSessionOpen": "expected_dummy_credential_timeout",
+              }))
           process.stdin.close()
           process.wait(timeout=10)
           PY