Azure AD ingestion source doesn't work with v2 (Entra ID) endpoints

[wfrced]

Describe the bug

Currently v2 endpoints are stated to not be supported. However, the only reason for this I could find is the strict enforcement of request fields schema by the v2 endpoints (v2 endpoints don't know about resource fields), and it seems like a trivial change to request formation would make it work - I've tested it using a custom ingestion source and it works.

To Reproduce

Steps to reproduce the behavior:

1. Try to ingest Azure AD data from Entra ID source (UI/CLI)
2. Get an HTTP 400 error

Additional context

Should be fixed by #11749