Adopt multi_agent_pipeline example to run from any folder

[StashaS]

Context:
Currently multi_agent_pipeline is executed successfully only if it runs from the project root folder. If the example runs from the example folder, file paths are interpreted wrongly and error No such file or directory: 'examples/test.yaml' appears.

Task:
Tinker the prompts to make the example run from both folders (root and root/examples). Agents should identify where the code run and understand the path accordingly.