refactor: remove Path field from git.Repository (#38552)

The "path" details should be hidden to other packages

By the way, fix a resource leaking in gogit's CommitNodeIndex
(the file was not closed in CacheCommit)

modules/templates/util_render_test.go

@@ -68,6 +68,7 @@ func newTestRenderUtils(t *testing.T) *RenderUtils {
 }
 
 func TestRenderRepoComment(t *testing.T) {
+	defer test.MockVariableValue(&setting.RepoRootPath, t.TempDir())()
 	mockRepo := &repo.Repository{
 		ID: 1, OwnerName: "user13", Name: "repo11",
 		Owner: &user_model.User{ID: 13, Name: "user13"},