Merge pull request #47125 from xxhdx1985126/wip-56535

crimson/os/seastore/async_cleaner: avoid trimming backrefs when reclaiming space

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

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

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

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