chore(openai): fix broken vcr cassette playback and add ci guard (#36502)

Fix broken VCR cassette playback in `langchain-openai` integration tests
and add a CI job to prevent regressions. Two independent bugs made all
VCR-backed tests fail: `before_record_request` redacts URIs to
`**REDACTED**` but `match_on` still included `uri` (so playback never
matched), and a typo-fix commit (`c9f51aef85`) changed test input
strings without re-recording cassettes (so `json_body` matching also
failed).

libs/partners/openai/tests/conftest.py

@@ -32,7 +32,9 @@ def vcr_config() -> dict:
     """Extend the default configuration coming from langchain_tests."""
     config = base_vcr_config()
     config["match_on"] = [
-        m if m != "body" else "json_body" for m in config.get("match_on", [])
+        m if m != "body" else "json_body"
+        for m in config.get("match_on", [])
+        if m != "uri"
     ]
     config.setdefault("filter_headers", []).extend(_EXTRA_HEADERS)
     config["before_record_request"] = remove_request_headers