Merge pull request #36397 from dzafman/wip-39012

distinguish unfound + impossible to find, vs start some down OSDs to get

Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>

diff --cc src/crimson/osd/pg_recovery.cc
Simple merge

diff --cc src/crimson/osd/recovery_backend.cc
Simple merge

diff --cc src/crimson/osd/replicated_recovery_backend.cc
Simple merge