fix: Change extend-excludes to force-excludes

    Black does not honor patterns in --excludes when explicitly
    provided on the cli. This is problematic when used with
    pre-commit since pre-commit _always_ provides a list of files
    to act on.

    `--force-exclude` seems to act identically to `--extend-excludes`
    but also applies to cli arguments.

    See psf/black#438 for more background

eng/black-pyproject.toml

@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 120
-extend-exclude = '''
+force-exclude = '''
 # Exclude some directories from formatting (note the slashes surrounding the pattern)
 /(
   azure/ai/ml/_restclient