feat(Google Vertex Chat Model Node): Add support for Google Vertex AI Chat models (#9970)

Co-authored-by: oleg <oleg@n8n.io>

packages/@n8n/nodes-langchain/package.json

@@ -65,6 +65,7 @@
       "dist/nodes/llms/LmChatAwsBedrock/LmChatAwsBedrock.node.js",
       "dist/nodes/llms/LmChatGooglePalm/LmChatGooglePalm.node.js",
       "dist/nodes/llms/LmChatGoogleGemini/LmChatGoogleGemini.node.js",
+      "dist/nodes/llms/LmChatGoogleVertex/LmChatGoogleVertex.node.js",
       "dist/nodes/llms/LmChatGroq/LmChatGroq.node.js",
       "dist/nodes/llms/LmChatMistralCloud/LmChatMistralCloud.node.js",
       "dist/nodes/llms/LMChatOllama/LmChatOllama.node.js",
@@ -129,6 +130,7 @@
     "@getzep/zep-cloud": "1.0.6",
     "@getzep/zep-js": "0.9.0",
     "@google-ai/generativelanguage": "2.5.0",
+    "@google-cloud/resource-manager": "5.3.0",
     "@google/generative-ai": "0.11.4",
     "@huggingface/inference": "2.7.0",
     "@langchain/anthropic": "0.1.21",
@@ -136,6 +138,7 @@
     "@langchain/community": "0.2.13",
     "@langchain/core": "0.2.9",
     "@langchain/google-genai": "0.0.16",
+    "@langchain/google-vertexai": "0.0.19",
     "@langchain/groq": "0.0.12",
     "@langchain/mistralai": "0.0.22",
     "@langchain/openai": "0.0.33",