[log classifier] Rule for graph break registry check (#6837)

For failures like [GH job
link](https://github.com/pytorch/pytorch/actions/runs/15859789097/job/44714997710)
[HUD commit
link](https://hud.pytorch.org/pytorch/pytorch/commit/c1ad4b8e7a16f54c35a3908b56ed7d9f95eef586)

Currently matches ` ##[error]Process completed with exit code 1.`
but there is a better line
`Found the unimplemented_v2 or unimplemented_v2_with_warning calls below
that don't match the registry in graph_break_registry.json.`

Author: clee2000

aws/lambda/log-classifier/ruleset.toml

@@ -20,6 +20,10 @@
 name = 'Operator backwards compatibility'
 pattern = '^The PR is introducing backward incompatible changes to the operator library.'
 
+[[rule]]
+name = 'Failed graph_break_registry check'
+pattern = '^Found the unimplemented_v2 or unimplemented_v2_with_warning calls below that don.t match the registry in graph_break_registry.json.'
+
 [[rule]]
 name = 'Lintrunner failure'
 pattern = '^>>> Lint for.*'