AgentRunner sets the wrong configuration
## Summary
We have started QA on 1.4.x and one major failure is that the AI Assistants API doesn't work by default. If you use the default provider, which is what Drupal CMS would use, it fails due to giving a faulty configuration value type.
The bug is due to a flaw in AI Agents, but could still be fixed in AI module as well - currently it is setting the wrong configuration method - `setConfiguration` instead of `setAiConfiguration` . The main bug is here: https://git.drupalcode.org/project/ai_agents/-/work_items/3584132
Follow the QA run here to reproduce: https://git.drupalcode.org/project/ai/-/work_items/3586424
## Steps to reproduce
1. Install the AI Chatbot, AI Assistants API, AI Agents modules if you haven't already.
2. Visit the AI Assistants page at https://drupal11-test.ddev.site/admin/config/ai/ai-assistant
3. Click "Add AI Assistant"
4. Set the Label to "Test Assistant"
5. Set the description to "This is a test assistant"
6. Under instructions set "Answer Banana"
7. Click "Save"
8. Visit Block Layout for Claro (or Gin if you use it): https://drupal11-test.ddev.site/admin/structure/block/list/claro or https://drupal11-test.ddev.site/admin/structure/block/list/gin
9. Under Content click "Place block"
10. Pick AI DeepChat Chatbot and click "Place block"
11. Select the "Test Assistant" you created in the dropdown.
12. Click "Save block"
13. Click "Save blocks"
14. Flush the cache.
15. You should now see the Assistant on the toolbar, click that.
16. Write something.
## Expected result
An answer.
## Actual result
Error message that a response could not be given
## Environment
- Drupal version: 11.3
- Module version: 1.4.x-dev
PHP version: 8.3
- Provider: OpenAI
- Last known working version: 1.3.x
## Potential fix
Use `setAiConfiguration` in `AgentRunner.php` instead of `setConfiguration`
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