Analysts/superusers adding domain managers via "Manage Domain" button sends emails

[abroddrick]

Issue description

We added email sending on the registrar and django admin when someone is invited/added as a domain manager to a domain. However, one hole in the current logic is that analysts who login to django admin, and click the "Manage Domain" button for a portfolio's domain, then add/invite someone as a domain manager will not have "portfolio invitation" created or the email sent inviting the person to the domain. There is also no language telling the analyst the invitation will not be sent. We want instead to make sure that portfolio invitations are sent if the domain is part of a portfolio.

Acceptance criteria

• Analyst/full access user can clickthe Manage Domain button on a portfolio's domain and adding someone to a domain (invitation or user domain role) via the Domain Managers tab in the registrar should send a portfolio invitation to the user if the domain has a portfolio attached.
• follow the normal logic for portfolio invitations, such as only send an email if the portfolio invitation doesn't exist, and don't create duplicate/ multiple portfolio invitations.

Additional context

No response

Links to other issues

• relates to Send email if a domain manager is removed from a domain #3285
• relates to Dev: Make updates to domain invitation emails #2960
• relates to Add email sending to the portfolio domain assignment review page #3295