chore: delete CLI (#34855)

preserved in
https://github.com/langchain-ai/langchain/tree/langchain-cli

.github/scripts/check_diff.py

@@ -56,7 +56,7 @@ def all_package_dirs() -> Set[str]:
     return {
         "/".join(path.split("/")[:-1]).lstrip("./")
         for path in glob.glob("./libs/**/pyproject.toml", recursive=True)
-        if "libs/cli" not in path and "libs/standard-tests" not in path
+        if "libs/standard-tests" not in path
     }
 
 
@@ -286,10 +286,6 @@ if __name__ == "__main__":
             dirs_to_run["test"].add("libs/partners/fireworks")
             dirs_to_run["test"].add("libs/partners/groq")
 
-        elif file.startswith("libs/cli"):
-            dirs_to_run["lint"].add("libs/cli")
-            dirs_to_run["test"].add("libs/cli")
-
         elif file.startswith("libs/partners"):
             partner_dir = file.split("/")[2]
             if os.path.isdir(f"libs/partners/{partner_dir}") and [