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/test_env.go

@@ -1,12 +1,16 @@
 package server
 
-import "github.com/grafana/grafana/pkg/services/sqlstore"
+import (
+	"github.com/grafana/grafana/pkg/services/notifications"
+	"github.com/grafana/grafana/pkg/services/sqlstore"
+)
 
-func ProvideTestEnv(server *Server, store *sqlstore.SQLStore) (*TestEnv, error) {
-	return &TestEnv{server, store}, nil
+func ProvideTestEnv(server *Server, store *sqlstore.SQLStore, ns *notifications.NotificationServiceMock) (*TestEnv, error) {
+	return &TestEnv{server, store, ns}, nil
 }
 
 type TestEnv struct {
-	Server   *Server
-	SQLStore *sqlstore.SQLStore
+	Server              *Server
+	SQLStore            *sqlstore.SQLStore
+	NotificationService *notifications.NotificationServiceMock
 }