Exclude Lazy Imports tests from ruff F811 check

Summary: Our Lazy Imports tests in 3.14 fail the lint check ([example job](https://github.com/facebookincubator/cinder/actions/runs/29703681881/job/88236940889)) because when our tests intentionally check that imports are lazy, the same import may be getting defined twice. This trips up F811. To fix this, we exclude the lazy imports tests from the check.

Reviewed By: kddnewton

Differential Revision: D112820282

fbshipit-source-id: d529896d0119c1e8a06607078347a8337878a84b

Author: Subbarao Garlapati

Lib/test/.ruff.toml

@@ -14,6 +14,9 @@ extend-exclude = [
     # New grammar constructions may not yet be recognized by Ruff,
     # and tests re-use the same names as only the grammar is being checked.
     "test_grammar.py",
+    # Lazy Imports tests intentionally re-import the same names to verify
+    # laziness, which trips F811.
+    "lazyimports/*.py",
 ]
 
 [lint]