Use absolute path path.resolve() -> path.absolute() (#129409)

Changes:

1. Always explicit `.absolute()`: `Path(__file__)` -> `Path(__file__).absolute()`
2. Replace `path.resolve()` with `path.absolute()` if the code is resolving the PyTorch repo root directory.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/129409
Approved by: https://github.com/albanD

test/distributed/_tensor/test_dtensor.py

@@ -2,9 +2,9 @@
 # Owner(s): ["oncall: distributed"]
 
 import os
-import pathlib
 import tempfile
 import unittest
+from pathlib import Path
 
 from numpy.testing import assert_array_equal
 
@@ -559,7 +559,7 @@ class DTensorTest(DTensorTestBase):
                 import_string = (
                     "import torch.distributed.tensor;" if should_import else ""
                 )
-                filename = pathlib.Path(f.name)
+                filename = Path(f.name)
                 err_msg = (
                     (
                         "_pickle.UnpicklingError: Weights only load failed. "