XYZ-37: Advanced Permissions Phase 1 Backend. (#8159)

* XYZ-13: Update Permission and Role structs to new design.

* XYZ-10: Role store.

* XYZ-9/XYZ-44: Roles API endpoints and WebSocket message.

* XYZ-8: Switch server permissions checks to store backed roles.

* XYZ-58: Proper validation of roles where required.

* XYZ-11/XYZ-55: Migration to store backed roles from policy config.

* XYZ-37: Update unit tests to work with database roles.

* XYZ-56: Remove the "guest" role.

* Changes to SetDefaultRolesFromConfig.

* Short-circuit the store if nothing has changed.

* Address first round of review comments.

* Address second round of review comments.

cmd/platform/server.go

@@ -78,6 +78,8 @@ func runServer(configFileLocation string, disableConfigWatch bool) {
 		a.LoadLicense()
 	}
 
+	a.DoAdvancedPermissionsMigration()
+
 	a.InitPlugins(*a.Config().PluginSettings.Directory, *a.Config().PluginSettings.ClientDirectory, nil)
 	a.AddConfigListener(func(prevCfg, cfg *model.Config) {
 		if *cfg.PluginSettings.Enable {