Secrets: Convert secret migration to a background service (#54676)

* Convert secret migration to a background service

* Fix merge conflicts

* Return concrete type for secret migration provider

pkg/server/server_test.go

@@ -7,12 +7,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/grafana/grafana/pkg/infra/serverlock"
 	"github.com/grafana/grafana/pkg/registry"
 	"github.com/grafana/grafana/pkg/server/backgroundsvcs"
 	"github.com/grafana/grafana/pkg/services/accesscontrol/acimpl"
-	"github.com/grafana/grafana/pkg/services/secrets/kvstore/migrations"
-	"github.com/grafana/grafana/pkg/services/sqlstore"
 	"github.com/grafana/grafana/pkg/services/user/usertest"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/stretchr/testify/require"
@@ -51,11 +48,7 @@ func (s *testService) IsDisabled() bool {
 
 func testServer(t *testing.T, services ...registry.BackgroundService) *Server {
 	t.Helper()
-	serverLockService := serverlock.ProvideService(sqlstore.InitTestDB(t))
-	secretMigrationService := &migrations.SecretMigrationServiceImpl{
-		ServerLockService: serverLockService,
-	}
-	s, err := newServer(Options{}, setting.NewCfg(), nil, &acimpl.Service{}, nil, backgroundsvcs.NewBackgroundServiceRegistry(services...), secretMigrationService, usertest.NewUserServiceFake(), nil)
+	s, err := newServer(Options{}, setting.NewCfg(), nil, &acimpl.Service{}, nil, backgroundsvcs.NewBackgroundServiceRegistry(services...), usertest.NewUserServiceFake(), nil)
 	require.NoError(t, err)
 	// Required to skip configuration initialization that causes
 	// DI errors in this test.