Notify Person via email when invited to new Group (fosterer, admin, super_admin)

[kasugaijin]

If a Person is invited to join an organization as a Fosterer or Staff (admin, super_admin), and the User / Person with the matching email does not exist, the User and Person are created. An invite email is sent. No other flow's currently have an email notification set up.

TODO:
Create an email notifying the person that they have been invited to be a "Fosterer" or "Admin" or "Super Admin" for the following cases:

Person already exists within the organization in a different Group (e.g. :adopter)

User exists (global scope) but no Person in this org

[atbalaji]

Hi @kasugaijin I would like to work on this

[github-actions]

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