Chore: Remove bus from ngalert (#44465)

* pass notification service down to the notifiers

* add ns to all notifiers

* remove bus from ngalert notifiers

* use smaller interfaces for notificationservice

* attempt to fix the tests

* remove unused struct field

* simplify notification service mock

* trying to resolve issues in the tests

* make linter happy

* make linter even happier

* linter, you are annoying

pkg/server/wire.go

@@ -190,6 +190,9 @@ var wireSet = wire.NewSet(
 	wireBasicSet,
 	sqlstore.ProvideService,
 	ngmetrics.ProvideService,
+	wire.Bind(new(notifications.Service), new(*notifications.NotificationService)),
+	wire.Bind(new(notifications.WebhookSender), new(*notifications.NotificationService)),
+	wire.Bind(new(notifications.EmailSender), new(*notifications.NotificationService)),
 )
 
 var wireTestSet = wire.NewSet(
@@ -197,6 +200,11 @@ var wireTestSet = wire.NewSet(
 	ProvideTestEnv,
 	sqlstore.ProvideServiceForTests,
 	ngmetrics.ProvideServiceForTest,
+
+	notifications.MockNotificationService,
+	wire.Bind(new(notifications.Service), new(*notifications.NotificationServiceMock)),
+	wire.Bind(new(notifications.WebhookSender), new(*notifications.NotificationServiceMock)),
+	wire.Bind(new(notifications.EmailSender), new(*notifications.NotificationServiceMock)),
 )
 
 func Initialize(cla setting.CommandLineArgs, opts Options, apiOpts api.ServerOptions) (*Server, error) {