multiple: Remove unnecessary Ruff suppression comments (#21050)

## Summary

I ran `ruff check --extend-select RUF100 -n` to identify `# noqa`
comments that weren't having any effect in Ruff, and then `ruff check
--extend-select RUF100 -n --fix` on select files to remove all of the
unnecessary `# noqa: F401` violations. It's possible that these were
needed at some point in the past, but they're not necessary in Ruff
v0.1.15 (used by LangChain) or in the latest release.

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/community/langchain_community/vectorstores/xata.py

@@ -27,7 +27,7 @@ class XataVectorStore(VectorStore):
     ) -> None:
         """Initialize with Xata client."""
         try:
-            from xata.client import XataClient  # noqa: F401
+            from xata.client import XataClient
         except ImportError:
             raise ImportError(
                 "Could not import xata python package. "