Refactors GetPluginDashboards/LoadPluginDashboard by moving database
interaction from plugin management to the plugindashboards service.
Fixes#44553
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
* Use PluginSettingsService instead of SQLStore in plugins
* Fix pluginproxy use of pluginsettings methods
* Fix additional pluginsettings methods
* Remove dispatch from plugindashboards
* Fix lint and adjust mock
* Remove unused pluginsettings
* Rename pluginsetting Service and ServiceImpl and add binding to wire
* Move pluginsettings binding in wire file
Moves/refactor Grafana specific functionality related to plugin dashboards
out to specific services for importing dashboards and keep app plugin dashboards
up-to-date.
Fixes#44257
