hgweb: map Abort to 403 error to report inaccessible path for example
Abort is so common in our codebase. We could instead introduce a dedicated type for path auditing errors, but we'll probably have to catch error.Abort anyway. As you can see, an abort message may include a full path to the repository, which might be considered information leak. If that matters, we should hide the message and send it to the server log instead.
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