Merge PR #50053 into main

Merge PR #50053 into main

* refs/pull/50053/head:
	libcephfs: move ClearSetuid to suidsgid.cc
	libcephfs: add test cases for dropping the suid/sgid in write/truncate
	libcephfs: add test cases for dropping the suid/sgid in fallocate
	libcephfs: fix ClearSetuid incorrectly using SETATTR_MODE mask
	client: switch to clear_suid_sgid for ftruncate
	client: switch to clear_suid_sgid for _write()
	mds/client: clear the suid/sgid in fallocate path
	client: allow unprivileged users to clear suid/sgid

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>