refactor: make git package handle all git operations (#38543)

before: gitrepo vs git packages
after: git package fully handle all git operations

by the way, use `WithRepo(repo)` instead of `WithDir(repo.Path)` to hide
path details.

benefits:

1. remove all unnecessary wrappers, developers no need to struggle with
"which package should be used"
2. simplify code, RepositoryFacade can (will) be used everywhere, all
"path" details are (will be) hidden

services/actions/reusable_workflow.go

@@ -16,7 +16,7 @@ import (
 	actions_module "gitea.dev/modules/actions"
 	"gitea.dev/modules/actions/jobparser"
 	"gitea.dev/modules/container"
-	"gitea.dev/modules/gitrepo"
+	"gitea.dev/modules/git"
 	"gitea.dev/modules/httplib"
 	"gitea.dev/modules/json"
 	"gitea.dev/modules/setting"
@@ -79,7 +79,7 @@ func loadReusableWorkflowSource(ctx context.Context, run *actions_model.ActionRu
 
 // readWorkflowFromRepo loads a workflow file from `repo` at `refOrSHA` and returns its content plus the resolved commit SHA.
 func readWorkflowFromRepo(ctx context.Context, repo *repo_model.Repository, refOrSHA, path string) ([]byte, string, error) {
-	gitRepo, err := gitrepo.OpenRepository(repo)
+	gitRepo, err := git.OpenRepository(repo)
 	if err != nil {
 		return nil, "", fmt.Errorf("open repo %s: %w", repo.FullName(), err)
 	}