rgw: fix stale entries in bucket indexes

rgw: fix stale entries in bucket indexes

If rados_osd_op_timeout is set, the primary osd is slow, the rgw_rados_operate for deleting the rgw head obj may return -ETIMEDOUT
rgw can't determine whether or not the delete succeeded, we shouldn't be calling index_op.complete_del or cancel()
Instead, we should leave that pending entry in the index so than bucket listing can recover with check_disk_state() and cls_rgw_suggest_changens()
When raced with another delete op, deleting the rgw head obj may return ENOENT, calling index_op.complete_del() instead of index_op.cancel()

Fixes: https://tracker.ceph.com/issues/58965
Signed-off-by: Shasha Lu <lu.shasha@aishu.cn>