Replace all references of "Azure Active Directory" to "Microsoft Entra ID"

Azure Active Directory has been rebranded to Microsoft Entra ID. But, some of our README.md, TROUBLESHOOTING.md and code comments still reference "Azure Active Directory". 

<img width="1224" height="783" alt="Image" src="https://github.com/user-attachments/assets/e44315b1-b5ef-42e7-98d1-7b24519cf661" />