[Angular - NgRx - SCSS] Create interceptor for application type

[lindakatcodes]

Per discussion: https://github.com/thisdot/starter.dev-github-showcases/pull/527/files#r997921100

It would be cleaner to create an interceptor that passes in the desired application type for all http calls. This ticket is to create that shared interceptor, as well as to go through the services and remove the headers setting and ensure all tests still pass.