Merge pull request #57262 from xxhdx1985126/wip-seastore-clone-remap-refcount

crimson/os/seastore/lba_manager: don't increase intermediate mappings' refcount if LBAManager::clone_mapping() is called to remap mappings

Reviewed-by: Yingxin Cheng <yingxin.cheng@intel.com>

diff --cc src/crimson/os/seastore/btree/fixed_kv_btree.h
Simple merge

diff --cc src/crimson/os/seastore/transaction_manager.cc
Simple merge