test(NODE-7278): update langchainjs location

Author: durran

langchain-js/run.sh

@@ -27,10 +27,12 @@ setup_node_and_yarn() {
     export npm_config_prefix
 
     npm install --global yarn
+    npm install -g corepack
+    corepack enable
 }
 
 setup_langchain_integration() {
-    cd libs/langchain-mongodb
+    cd libs/providers/langchain-mongodb
 
     yarn install
     yarn build