Follow-up to #3992, which gated the send runner-side - but only for new
runner images. Existing runners still POST a debug log per line.
When `SEND_RUN_DEBUG_LOGS` is off (default), the route now drops the
request immediately: `skipBodyParsing` skips the body read/parse, a bare
handler returns 204, no wide event. The route stays registered so it
avoids the `No route match` error log; the only per-request log left is
the framework's `logger.debug` trace, suppressed at the default `info`
level. Still counted by request metrics, and 204 is non-retryable so no
retry storm.
Adds a `skipBodyParsing` flag to the internal HTTP server.
nicktrn
7621601ecd