infra: add -p to mkdir in lint steps (#17013)

Previously, if this did not find a mypy cache then it wouldnt run

this makes it always run

adding mypy ignore comments with existing uncaught issues to unblock other prs

---------

Co-authored-by: Erick Friis <erick@langchain.dev>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/community/langchain_community/utilities/brave_search.py

@@ -48,7 +48,7 @@ class BraveSearchWrapper(BaseModel):
         results = self._search_request(query)
         return [
             Document(
-                page_content=item.get("description"),
+                page_content=item.get("description"),  # type: ignore[arg-type]
                 metadata={"title": item.get("title"), "link": item.get("url")},
             )
             for item in results