remove deprecated wandb env var (#2751)

* remove deprecated wandb env var

* remove os.environ wandb setting; unused loggers

* remove os.environ wandb setting; unused loggers

tests/e2e/test_evaluate.py

@@ -1,6 +1,5 @@
 """E2E smoke test for evaluate CLI command"""
 
-import os
 from pathlib import Path
 
 import yaml
@@ -9,8 +8,6 @@ from transformers.testing_utils import get_torch_dist_unique_port
 
 from axolotl.utils.dict import DictDefault
 
-os.environ["WANDB_DISABLED"] = "true"
-
 
 class TestE2eEvaluate:
     """Test cases for evaluate CLI"""