[log classifier] Match against newly added string for consistent failures (#7333)

Context + corresponding PR:
pytorch/pytorch#165163

Author: clee2000

aws/lambda/log-classifier/ruleset.toml

@@ -84,6 +84,10 @@ pattern = '^ERROR: (.*(?:bazel|WORKSPACE|target).*)'
 name = 'Bazel build failure'
 pattern = '^FAILED: Build did NOT complete successfully'
 
+[[rule]]
+name = 'Python unittest failure'
+pattern = '^FAILED CONSISTENTLY: (.*)$'
+
 [[rule]]
 name = 'Python unittest failure'
 pattern = 'FAIL(?: \[.*\])?: (test.*) \((?:__main__\.)?(.*)\)'