Merge pull request #46685 from Rethan/perf-limit-dump-loads-depth

mds/MDBalancer: add an arg to limit depth when dump loads for dirfrags

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Ramana Raja <rraja@redhat.com>

diff --cc qa/tasks/cephfs/test_admin.py
Simple merge

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

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

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