Allow to set Chat History on agent runner

@marcus_johansson the previous code used $message['message'] and new version uses $message['content'].

It causes a fatal error in the chatbot:
new ChatMessage($message['role'], $message['content']) - Argument #2 ($text) must be of type string, null given.

Do we need to update \Drupal\ai_assistant_api\AiAssistantApiRunner::getMessageHistory() to use 'content' array key instead of 'message'?

I’m also encountering the same issue.
Steps to Reproduce:
Install the following modules:

1. ai, ai_provider_openai, ai_agents, ai_assistant_api, ai_chatbot
2. Create an assistant and select any agent from the list.
3. Set the agent to be used as the assistant.
4. Place the AI Chatbot block in the block layout.
5. Try interacting with the chatbot

Observed Issue:
When sending a message to the chatbot, the following error is thrown:

TypeError: Drupal\ai\OperationType\Chat\ChatMessage::__construct(): 
Argument #2 ($text) must be of type string, null given, 
called in /var/www/html/modules/contrib/ai/modules/ai_assistant_api/src/Service/AgentRunner.php on line 42

Due to the fatal error issue, changing the status to NW.

I have reviewed the fix. It works fine. Moving to RTBC

+1 as well, fixed for me

Thank you all, getting merged into 1.1.x and added to 1.2.x as well.