Enterprise: websocket and streaming endpoints fail with audit logging enabled

[drewbailey]

When audit logging is enabled on enterprise nomad agents, nomad alloc exec fails to upgrade the connection to a websocket. Streaming HTTP requests like nomad monitor and nomad alloc logs -f also fail to flush when sending new output.

               Test:           TestE2E/Nomad_exec/*nomadexec.NomadExecE2ETest_(docker)/TestExecBasicResponses/tty:_streaming
=== RUN   TestE2E/Nomad_exec/*nomadexec.NomadExecE2ETest_(docker)/TestExecBasicResponses/tty:_stty_check
    exec.go:93:
                Error Trace:    exec.go:93
                Error:          Received unexpected error:
                                Unexpected response code: 500 (Internal Server Error
                                failed to upgrade connection: websocket: response does not implement http.Hijacker)
                Test:           TestE2E/Nomad_exec/*nomadexec.NomadExecE2ETest_(docker)/TestExecBasicResponses/tty:_stt

[github-actions]

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