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/callbacks/argilla_callback.py

@@ -54,7 +54,7 @@ class ArgillaCallbackHandler(BaseCallbackHandler):
 
     REPO_URL: str = "https://github.com/argilla-io/argilla"
     ISSUES_URL: str = f"{REPO_URL}/issues"
-    BLOG_URL: str = "https://docs.argilla.io/en/latest/tutorials_and_integrations/integrations/use_argilla_callback_in_langchain.html"  # noqa: E501
+    BLOG_URL: str = "https://docs.argilla.io/en/latest/tutorials_and_integrations/integrations/use_argilla_callback_in_langchain.html"
 
     DEFAULT_API_URL: str = "http://localhost:6900"
 
@@ -92,7 +92,7 @@ class ArgillaCallbackHandler(BaseCallbackHandler):
 
         # Import Argilla (not via `import_argilla` to keep hints in IDEs)
         try:
-            import argilla as rg  # noqa: F401
+            import argilla as rg
 
             self.ARGILLA_VERSION = rg.__version__
         except ImportError: