Merge pull request #22528 from rjfd/wip-dashboard-fix-rest-controller

mgr/dashboard: restcontroller: minor improvements and bug fixes

Reviewed-by: Patrick Nawracay <pnawracay@suse.com>
Reviewed-by: Ricardo Marques <rimarques@suse.com>
Reviewed-by: Sebastian Wagner <swagner@suse.com>
Reviewed-by: Tatjana Dehler <tdehler@suse.com>
Reviewed-by: Volker Theile <vtheile@suse.com>

diff --cc src/pybind/mgr/dashboard/controllers/__init__.py
Simple merge