[North Star Applicant UI] Create application submitted page

[greg-hyde]

Create the page shown to users after they submit an application

[greg-hyde]

Lots of random information for getting started working on thymeleaf

Specs for the north star: https://www.figma.com/file/RmhVJCLgAKWGENJLWWAtNS/CiviForm%3A-Components%2C-Styles?node-id=1890%3A3285&mode=dev

Note: those specs don't include the application submitted page but do have more general information. I wouldn't bother adding a lot of styles in the first implementation PR since we don't have finalized specs, and some CSS changes we'll get for free across the app.

Use USWDS components where applicable

You can enable the flag on a local server with this URL http://localhost:9000/dev/feature/NORTH_STAR_APPLICANT_UI/enable

Example PR: #6701

Current page looks like this

https://github.com/civiform/civiform/blob/main/server/app/controllers/applicant/UpsellController.java is the relevant controller. We'll eventually do two views (Common intake and standard), but that doesn't need to be done all at once