[hf] return well-formed signal val when ignoring "cry wolf" hc fail
requested to merge hf-return-well-formated-signal-value-when-ignoring-cried-wolf-healthcheck-fail into main
- BUG: ignored failed healthcecks from "boy who cried wolf" channel appear to be throwing uncaught promises
- LIKELY CAUSE: returning null instead of an
{ isFatal: boolean }object to caller - FIX: return
{ isFatal: false }