tests: unmark exp celery tests as xfail

tests/func/experiments/test_apply.py

@@ -1,4 +1,3 @@
-import dulwich.errors
 import pytest
 from funcy import first
 
@@ -27,14 +26,6 @@ def test_apply(tmp_dir, scm, dvc, exp_stage):
     assert (tmp_dir / "metrics.yaml").read_text().strip() == "foo: 3"
 
 
-@pytest.mark.xfail(
-    raises=(
-        dulwich.errors.CommitError,
-        dulwich.file.FileLocked,
-    ),
-    strict=False,
-    reason="See https://github.com/iterative/dvc/issues/8570",
-)
 def test_apply_failed(tmp_dir, scm, dvc, failed_exp_stage, test_queue):
     from dvc.exceptions import InvalidArgumentError