Remove bus from datasource api (#44987)

* Remove bus from datasource api

* Add DatasourcePermissionService and use it in api

* Fix wire and rename

* Fix import in wire

* Fix bug

* Rename Service to OSS service

* Roll back fix

pkg/api/datasource_permissions_mocks.go

@@ -0,0 +1,20 @@
+package api
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/models"
+)
+
+type mockDatasourcePermissionService struct {
+	dsResult []*models.DataSource
+}
+
+func (m *mockDatasourcePermissionService) FilterDatasourcesBasedOnQueryPermissions(ctx context.Context, cmd *models.DatasourcesPermissionFilterQuery) error {
+	cmd.Result = m.dsResult
+	return nil
+}
+
+func newMockDatasourcePermissionService() *mockDatasourcePermissionService {
+	return &mockDatasourcePermissionService{}
+}