Rename AAD to Entra in docs

[milanholemans]

In the aftermath of #5663, let's recheck our docs and replace all references of Azure Active Directory (AAD) to Microsoft Entra ID.

Example where we still use Azure Active Directory: https://pnp.github.io/cli-microsoft365/user-guide/using-own-identity#register-azure-ad-application-in-your-tenant

[waldekmastykarz]

Let's consider this documentation to decide when to use Entra ID and when to use Entra: https://learn.microsoft.com/en-us/entra/fundamentals/new-name

[nanddeepn]

Can I work on it?