Set up production Microsoft Entra ID instance

[angela-tran]

Depends on #2263, where we will learn more about what needs to be set up

We will probably need help from CDT DevSecOps on this.

The idea is to set up a tenant in the CDT Azure environment and create a registered application to represent the Benefits app. This registered application will have a client secret. The application ID and client secret are then used to configure Microsoft SSO for the Benefits app.

External users are then invited to have access to the tenant which gives them access to the registered application. Because of that relationship, they should be able to successfully authenticate into the Benefits admin with Microsoft SSO.

Acceptance criteria

• There is a tenant set up in the production CDT Azure environment which allows us to invite external users to access the registered application for Benefits

Additional context

Adding Microsoft credentials