Refactor XB AI module

Overview

Here are some refactoring that can be done as a part of this issue:

1. Issues #3529313: Add `getStructuredOutput()` method to ExecutableFunctionCallInterface for returning parsed output and #3529310: Improve ai_agents module API to simplify tool result handling introduced new methods that, when implemented, will help reduce code complexity in the current XbBuilder::render method. Incorporating these methods is recommended to simplify the codebase.

   Additionally, as per #3532026: Set TaskInterface and setTask as deprecated for 2.0.0, the Task interface is deprecated. Therefore, the solution provided in https://git.drupalcode.org/project/experience_builder/-/merge_requests/1... should be adopted.

2. Refactor the AI Orchestrator agent to make it simple.
3. We don't need field_name in CreateFieldContent tool and also it would make sense to rename the CreateFieldContent and EditFieldContent for now as they only create content for title. We can further generalise it if we add any new feature.
4. Instead of creating a new file for props schema we can add the hardcoded values in the default context for suitable agent that uses it(in this case it is component agent)

Proposed resolution

User interface changes