Chore: Remove bus.Bus field (#47695) (#47704)

* Chore: Remove bus.Bus field

* fix integration test

(cherry picked from commit e86b6662a1)

Co-authored-by: Serge Zaitsev <serge.zaitsev@grafana.com>

pkg/tests/api/alerting/api_alertmanager_configuration_test.go

@@ -8,7 +8,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
@@ -34,9 +33,6 @@ func TestAlertmanagerConfigurationIsTransactional(t *testing.T) {
 	// editor from main organisation requests configuration
 	alertConfigURL := fmt.Sprintf("http://editor:editor@%s/api/alertmanager/grafana/config/api/v1/alerts", grafanaListedAddr)
 
-	// override bus to get the GetSignedInUserQuery handler
-	store.Bus = bus.GetBus()
-
 	// create user under main organisation
 	userID := createUser(t, store, models.CreateUserCommand{
 		DefaultOrgRole: string(models.ROLE_EDITOR),
@@ -145,9 +141,6 @@ func TestAlertmanagerConfigurationPersistSecrets(t *testing.T) {
 	grafanaListedAddr, store := testinfra.StartGrafana(t, dir, path)
 	alertConfigURL := fmt.Sprintf("http://editor:editor@%s/api/alertmanager/grafana/config/api/v1/alerts", grafanaListedAddr)
 
-	// override bus to get the GetSignedInUserQuery handler
-	store.Bus = bus.GetBus()
-
 	createUser(t, store, models.CreateUserCommand{
 		DefaultOrgRole: string(models.ROLE_EDITOR),
 		Password:       "editor",