crimson: use make_interruptible, coroutine, and RAII releaser for recover_object_with...

crimson: use make_interruptible, coroutine, and RAII releaser for recover_object_with_throttle

791772f1c used with_throttle here in a way which caused
then_interruptible in PGRecovery::recover_object to be called outside of
an interruptible context.

Instead of using a wrapper taking a lambda, rephrase as an RAII releaser
suitable for use in a coroutine.  This avoids needing to structure
with_throttle to deal correctly with both interruptible and
non-interruptible contexts.

Fixes: https://tracker.ceph.com/issues/70939
Signed-off-by: Samuel Just <sjust@redhat.com>