Update Policy-based auth instructions to use cURL

[Rick-Anderson]

Description

#33094 removed Postman per security updates. The instructions for testing the app need to be update.

Extract the commands from the ContosoAPI.collection.json file and use them to construct cURL commands to test the app.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/authorization/policies?view=aspnetcore-8.0&branch=pr-en-us-33094

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authorization/policies.md

Document ID

7089b376-949f-c1c6-c37a-5d8cc7ecf104

Article author

@Rick-Anderson