Merge PR #61940 into wip-khiremat-testing-20250306.135557-reef-debug

* refs/pull/61940/head:
	reef:mds: fix backporting merge errors
	mds: use system error codes instead of CEPHFS_EXX codes
	mds,client: change result field handling in the MClientReply message
	mds: prepare infra to replace CEPHFS_EXXX codes to system codes
	pybind/cephfs: switch CEPHFS_E error codes to system error codes
	PendingReleaseNotes: add note on client/mds error codes

diff --cc src/mds/MDCache.cc
Simple merge

diff --cc src/mds/MDSDaemon.cc
Simple merge

diff --cc src/mds/MDSRank.cc
Simple merge

diff --cc src/mds/Server.cc
Simple merge

diff --cc src/mds/Server.h
Simple merge