Workhorse: propagate connection abort

Mikhail Mazurskiyrequested to merge
ash2k/propagate-conn-abort into master

What does this MR do and why?

This reverts Don't log http.ErrAbortHandler panics in sentry (gitlab-workhorse!392 - merged) and propagates the panic(http.ErrAbortHandler) to abort the incoming TCP connection to let the client know there was a problem.

References

Relates to 2025-09-02: Jobs stuck in running indefinitely (gitlab-com/gl-infra/production#20469).

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