Updates the Fault Detector to properly handle connection failures when
trying to query the L2 node. Also increments a new metric whenever this
happens so we can keep track of these failures if necessary.
Co-authored-by: Mark Tyneway <mark.tyneway@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>