osd: add clear_shards_repaired command

osd: add clear_shards_repaired command

This command will allow us to clear the OSD_TOO_MANY_REPAIRS alert
by setting the shard repair count to 0. This will help in cases where
the alert was a false positive, or a condition that has since cleared
at the disk level. Often, zeroing out the repair count is
better than muting the alert or restarting the OSD.

Fixes: https://tracker.ceph.com/issues/54182
Co-authored-by: David Zafman <dzafman@redhat.com>
Signed-off-by: Daniel Radjenovic <dradjenovic@digitalocean.com>
(cherry picked from commit 78d6bfe54c3b9b60fab36a640b1ce77c8f022fa9)