Ensure remote respects recursion_limit param if it's passed (#3470)

Currently when using RemoteGraph the recursion_limit cannot be set, due
to the sanitize_config.

---------

Co-authored-by: Simon Moxon <simon@together.ly>
Co-authored-by: Vadym Barda <vadim.barda@gmail.com>

libs/langgraph/langgraph/pregel/remote.py

@@ -323,11 +323,15 @@ class RemoteGraph(PregelProtocol):
             if k not in reserved_configurable_keys and not k.startswith("__pregel_")
         }
 
-        return {
+        sanitized: RunnableConfig = {
             "tags": config.get("tags") or [],
             "metadata": config.get("metadata") or {},
             "configurable": new_configurable,
         }
+        if "recursion_limit" in config:
+            sanitized["recursion_limit"] = config["recursion_limit"]
+
+        return sanitized
 
     def get_state(
         self, config: RunnableConfig, *, subgraphs: bool = False