Merge PR #30475 into master

* refs/pull/30475/head:
	qa/standalone/ceph-helpers: default pg autoscale mode off for standalone
	os/bluestore: fix objectstore_blackhole read-after-write
	test,misc: do not specify pg_num per pool
	mgr/volumes: do not specify pg_num
	pybind/ceph_volume_client: do not specify pg_num for new pools
	doc: remove all pg_num arguments to 'osd pool create'
	mon: do not require pg_num to 'osd pool create'
	common: default pg_autoscale_mode=on for new pools

Reviewed-by: xie xingguo <xie.xingguo@zte.com.cn>