Merge pull request #49344 from xxhdx1985126/wip-obc-watchers-checkonload

crimson/osd/object_context_loader: check on old watchers when loading obcs

Reviewed-by: Samuel Just <sjust@redhat.com>

diff --cc src/crimson/os/seastore/seastore.cc
Simple merge

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

diff --cc src/crimson/osd/pg.h
Simple merge

diff --cc src/test/crimson/seastore/test_seastore.cc
Simple merge