Auth: Add prometheus metrics for case insensitive ids (#52162)

* rename file

* add promstats for authinfostore every 4h

* add mixed cased users

* cherry pick and cleanup

* fix: query login,email instead of count()

* FIX: mysql missing alias to subquery

* fix: query working on mysql, sqllite3, and pg

pkg/server/backgroundsvcs/background_services.go

@@ -16,6 +16,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/guardian"
 	"github.com/grafana/grafana/pkg/services/live"
 	"github.com/grafana/grafana/pkg/services/live/pushhttp"
+	"github.com/grafana/grafana/pkg/services/login/authinfoservice"
 	"github.com/grafana/grafana/pkg/services/ngalert"
 	"github.com/grafana/grafana/pkg/services/notifications"
 	plugindashboardsservice "github.com/grafana/grafana/pkg/services/plugindashboards/service"
@@ -40,7 +41,7 @@ func ProvideBackgroundServiceRegistry(
 	pluginsUpdateChecker *updatechecker.PluginsService, metrics *metrics.InternalMetricsService,
 	secretsService *secretsManager.SecretsService, remoteCache *remotecache.RemoteCache,
 	thumbnailsService thumbs.Service, StorageService store.StorageService, searchService searchV2.SearchService, entityEventsService store.EntityEventsService,
-	saService *samanager.ServiceAccountsService,
+	saService *samanager.ServiceAccountsService, authInfoService *authinfoservice.Implementation,
 	// Need to make sure these are initialized, is there a better place to put them?
 	_ dashboardsnapshots.Service, _ *alerting.AlertNotificationService,
 	_ serviceaccounts.Service, _ *guardian.Provider,
@@ -71,6 +72,7 @@ func ProvideBackgroundServiceRegistry(
 		searchService,
 		entityEventsService,
 		saService,
+		authInfoService,
 	)
 }