Provide explicit list of the identity types required for a pseudonymous profile

Good day team.

Could you please include an explicit list of the [identity types ](https://experienceleague.adobe.com/en/docs/experience-platform/identity/features/namespaces#identity-type) that are required for a profile to qualify as pseudonymous?

Issue in ./help/profile/pseudonymous-profiles.md

Start with help/profile/pseudonymous-profiles.md and review the linked identity types documentation. Add an explicit list of the identity types required for a profile to qualify as pseudonymous, then verify that the wording and reference link are accurate.

Written by the indexing model from the issue text.