Add failure-output option to zuul-nox-py311 job

This uses the new regex-based early detection feature to mark
the nox-py311 job as failing while it's still running.

Change-Id: I3fb23d51ccc02e0db4b288e9f343c6e282af2cb6

.zuul.yaml

@@ -117,6 +117,10 @@
     name: zuul-nox-py311
     parent: zuul-nox
     timeout: 7200  # 120 minutes
+    failure-output:
+      # This matches stestr output when a test fails
+      # {1} tests.unit.test_blah [5.743446s] ... FAILED
+      - '\{\d+\} (.*?) \[[\d\.]+s\] \.\.\. FAILED'
     vars:
       nox_keyword: tests