[Frontend] error suppression cleanup

[joerunde]

This removes one unnecessary suppression in the api server for do_log_stats, and adds a timeout suppression on aborts.
@robertgshaw2-neuralmagic found that canceling ~20k requests with others in flight will cause the backend to take a very long time to respond to the abort requests, though it will properly abort all requests eventually. We'd rather "fire and forget" the abort messages in this case, than fill up the logs with errors about timeouts or clog the server up even more with retries.

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[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which consists a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of default ones by unblocking the steps in your fast-check build on Buildkite UI.

Once the PR is approved and ready to go, please make sure to run full CI as it is required to merge (or just use auto-merge).

To run full CI, you can do one of these:

• Comment /ready on the PR
• Add ready label to the PR
• Enable auto-merge.

🚀

[joerunde]

/ready

[robertgshaw2-neuralmagic]

Am I right that test request id will trigger an Exception?

[joerunde]

The m.setattr(dummy_server, "abort", lambda x: None) patches the server to just do nothing when it gets an abort request, so no it shouldn't cause an exception

[robertgshaw2-neuralmagic]

I see. Thanks

[robertgshaw2-neuralmagic]

I think we should have a very detailed comment here about why this is okay, including the notes from slack