Merge PR #48382 into main

Merge PR #48382 into main

* refs/pull/48382/head:
	test: add test to validate attrs for snapdir after snap operations
	client: update {m,c}time and change attr for snapdir from last modification time of a snap realm
	mds: update last modification time and change attr for a snap realm node
	mds: include last modification time and change attr of a snap realm node in snap trace reply
	mds: use change_attr from closest ancestor when initializing a new snaprealm
	mds: initialize last_modified to current timestamp for root inode snaprealm
	mds: track last modification time and change attr for a snap realm node (srnode)

Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>