Merge pull request #56654 from aaSharma14/wip-65142-reef

reef: mgr/dashboard: replace piechart plugin charts with native pie chart panel

Reviewed-by: Nizamudeen A <nia@redhat.com>

diff --cc monitoring/ceph-mixin/dashboards/osd.libsonnet
Simple merge

diff --cc monitoring/ceph-mixin/dashboards/utils.libsonnet
Simple merge

diff --cc monitoring/ceph-mixin/dashboards_out/osds-overview.json
Simple merge