Revert "fix(parsing): don't validate input tools in the asynchronous .parse() method"

This reverts commit 257d79e.

Author: RobertCraigie

src/openai/resources/beta/chat/completions.py

@@ -268,8 +268,6 @@ def stream(
         When the context manager exits, the response will be closed, however the `stream` instance is still available outside
         the context manager.
         """
-        _validate_input_tools(tools)
-
         extra_headers = {
             "X-Stainless-Helper-Method": "beta.chat.completions.stream",
             **(extra_headers or {}),