Updates the form visuals and functionality according to new wireframes:
the form on the Project Settings > Information page has been split into
multiple discrete forms.
In detail:
* Introduces `Projects::Settings::General::ShowComponent`.
* Creates Primer forms with basic specs.
* Adds `Projects::Settings::GeneralController#update` action, routes and
accompanying permissions.
* Updates "Edit Settings" feature specs for new forms, also rewriting
some expectations that were reliant on `data-qa-name` attribute that
Primer form components do not render by default.
Tomas Hykel