Extract search users functions into a service (#39002)

* Extract search users to a new service

* Fix wire provider

* Fix common_test and remove RouteRegister

* Remove old endpoints

* Fix test

* Add indexes to dashboards and orgs tables

* Fix lint

pkg/services/sqlstore/migrations/dashboard_mig.go

@@ -225,4 +225,9 @@ func addDashboardMigration(mg *Migrator) {
 
 	mg.AddMigration("delete stars for deleted dashboards", NewRawSQLMigration(
 		"DELETE FROM star WHERE dashboard_id NOT IN (SELECT id FROM dashboard)"))
+
+	mg.AddMigration("Add index for dashboard_is_folder", NewAddIndexMigration(dashboardV2, &Index{
+		Cols: []string{"is_folder"},
+		Type: IndexType,
+	}))
 }