tests: use session-scoped exp celery fixtures when possible

tests/func/experiments/test_queue.py

@@ -19,6 +19,7 @@ def test_celery_logs(
     failed_exp_stage,
     follow,
     capsys,
+    test_queue,
 ):
     celery_queue = dvc.experiments.celery_queue
     dvc.experiments.run(failed_exp_stage.addressing, queue=True)
@@ -37,6 +38,7 @@ def test_queue_remove_done(
     dvc,
     exp_stage,
     failed_exp_stage,
+    test_queue,
 ):
     queue_length = 3
     success_tasks = []