Limit domain whitelist globally in dex instead of specific connector

[maordavidov]

Preflight Checklist

• [X] I agree to follow the Code of Conduct that this project adheres to.
• [X] I have searched the issue tracker for an issue that matches the one I want to file, without success.

Problem Description

Google connector allows to specify hostedDomains to whitelist specific domains. When using Microsoft connector I'm unable to do that, the only option is to use tenants but that's also not great because I can specify only a single tenant.

It will be nice if we could have a single approach to whitelist domains.

Proposed Solution

Create a global hostedDomains filter (I would call it domainWhitelist maybe), so it will effect all connectors.

Alternatives Considered

No response

Additional Information

No response