Refactor AI messaging and deactivate certain models

The LLM method to get AI messages is refactored to simplify the process by going straight to the message content. Additionally, several AI models have been deactivated. The models with Llama Guard have been commented out of the model list to put them on hold. This is a temporary measure and these models might be reinstantiated in the future.

guardrails_models.py

@@ -125,9 +125,9 @@ def gemini_pro(
         if ai:
             history_langchain_format.append(AIMessage(ai))
     try:
-        ai_message = llm.stream(history_langchain_format)
-        for message in ai_message:
-            yield message.content
+        ai_message = llm(history_langchain_format)
+        for message in ai_message.content:
+            yield message
     except BlockedPromptException:
         yield "⚠️ I'm sorry, I cannot respond to that. (The input was blocked by the LLM)"
     except StopCandidateException:
@@ -420,22 +420,22 @@ def get_all_models():
             "name": "Gemini-Pro",
             "model": gemini_pro,
         },
-        {
-            "name": "gpt3.5-turbo-1106 + Llama Guard",
-            "model": gpt35_turbo_llamaguard,
-        },
-        {
-            "name": "Llama-2-70b-chat-hf + Llama Guard",
-            "model": llama70B_llamaguard,
-        },
-        {
-            "name": "Mixtral-8x7B-Instruct-v0.1 + Llama Guard",
-            "model": mixtral7x8_llamaguard,
-        },
-        {
-            "name": "Gemini-Pro + Llama Guard",
-            "model": gemini_pro_llamaguard,
-        },
+        # {
+        #     "name": "gpt3.5-turbo-1106 + Llama Guard",
+        #     "model": gpt35_turbo_llamaguard,
+        # },
+        # {
+        #     "name": "Llama-2-70b-chat-hf + Llama Guard",
+        #     "model": llama70B_llamaguard,
+        # },
+        # {
+        #     "name": "Mixtral-8x7B-Instruct-v0.1 + Llama Guard",
+        #     "model": mixtral7x8_llamaguard,
+        # },
+        # {
+        #     "name": "Gemini-Pro + Llama Guard",
+        #     "model": gemini_pro_llamaguard,
+        # },
         {
             "name": "gpt3.5-turbo-1106 + NeMo Guardrails",
             "model": gpt35_turbo_nemoguardrails,