feat(tests): add conftest.py for pytest configuration and environment setup

tests/conftest.py

@@ -0,0 +1,11 @@
+import os
+from pathlib import Path
+
+
+if "LITELLM_UI_PATH" not in os.environ:
+    worker = os.environ.get("PYTEST_XDIST_WORKER", f"pid-{os.getpid()}")
+    os.environ["LITELLM_UI_PATH"] = str(
+        Path(__file__).resolve().parents[1]
+        / ".pytest_cache"
+        / f"litellm-ui-{worker}"
+    )