Fix 41: Create/Delete Provider Types

[frankduncan]

This grew to more than just #41, as it appeared the entire provider type editing UI was incomplete.

Test by adding, editing, and deleting provider types from the admin interface. Additional check to see if agreements and license options are added to enrollments.

[frankduncan]

Thanks for the review @PaulMorris ! I did some discussion inline before I make some of the changes you were requesting. I'm also requesting a quick review from @jasonaowen as a secondary sanity check.

[PaulMorris]

Per discussion on zulip, I've added some commits for the CSS part. I'm +1 to merge pending @jasonaowen taking a look.

[jasonaowen]

@frankduncan this is pretty amazing! Awesome job.

In particular, I like the logic around disabling deletion if there are existing enrollments with that provider type or if there are provider type settings.

Is there a way to add organizational provider types, or only individual?

There is, I think, follow-up work to fully complete the feature of "adding and editing provider types", but this PR is probably enough to resolve #41. Can you help me figure out the remaining steps necessary, and then we can open issues?

• Allow admins to configure the information collection screens required for a provider type (I feel like we talked about this, and agreed how bad the current approach is, but I don't remember / can't find an issue for it)
• Split up provider type settings, and expose admin UI for configuring each (see PRs #86 and #99 for earlier examples)

• 946, as you previously opened - thank you

[frankduncan]

I've opened #1060, #1061, and #1062 for these issues. Yay!