Merge pull request #20103 from openattic/wip-mgr-dashboard_v2

mgr/dashboard_v2: Initial submission of a web-based management UI (replacement for the existing dashboard)

Reviewed-by: Nathan Cutler <ncutler@suse.com>
Reviewed-by: John Spray <john.spray@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc CMakeLists.txt
Simple merge

diff --cc src/test/CMakeLists.txt
Simple merge