Fix missing Close when error occurs and abused connection pool (#35658)

Fix #35649

* Use upstream `git-lfs-transfer`
* The Close should be called when error occurs (bug fix)
* The connection pool should be shared (bug fix)
* Add more tests to cover "LFS over SSH download"

modules/private/restore_repo.go

@@ -6,7 +6,6 @@ package private
 import (
 	"context"
 	"fmt"
-	"time"
 
 	"code.gitea.io/gitea/modules/setting"
 )
@@ -31,6 +30,6 @@ func RestoreRepo(ctx context.Context, repoDir, ownerName, repoName string, units
 		Units:      units,
 		Validation: validation,
 	})
-	req.SetTimeout(3*time.Second, 0) // since the request will spend much time, don't timeout
+	req.SetReadWriteTimeout(0) // since the request will spend much time, don't timeout
 	return requestJSONClientMsg(req, fmt.Sprintf("Restore repo %s/%s successfully", ownerName, repoName))
 }