Clarify azure.ai.project ownership across project workflows

[huimiu]

Summary

Make ownership of azure.ai.project explicit and consistent across the Azure AI project workflows.

What to do

• Establish a clear ownership model for project resources.
• Route project-level operations through the project owner instead of individual resource helpers where appropriate.
• Keep initialization, adoption, and managed-resource flows aligned with the same ownership rules.
• Add focused tests for project ownership, resource discovery, and error handling.
• Update user-facing guidance where the ownership model affects behavior.

Outcome

Project resources have one predictable ownership path, reducing duplicated logic and making future workflow changes safer.