Don't allow non-org model domain requests for federal agencies in a portfolio

[abroddrick]

Issue description

As an admin or similiar individual on a federal portfolio
I don't want anyone to be able to submit a domain request for my federal agency without that person being a member of my organization
so that only people trusted agency members are able to make a domain request for my agency.

Acceptance criteria

• Once a federal portfolio exists and the domain requests flag is on, we no longer allow selecting that federal agency on the non-org model domain request flow.
  • the agency should no longer appear in the drop down on the non org model domain request flow

Additional context

Federal Agency is currently from a table so this will mean the drop down can no longer display directly from the table. You may have to preprocess with a left join with federal agency on the left and portfolios on the right.

Links to other issues

No response

[zandercymatics]

@abroddrick Question regarding this portion of the ac: and the domain requests flag is on. Since waffle flags can be configured per user, how would we want to handle that in this case? Would this only apply if the user themselves have the organization_feature + organization_requests waffle flag, but aren't presently in a portfolio?

[abroddrick]

For domain requests and Member management we will not be turning on waffle flags on a per user basis and will instead use them like switches, on or off.