Only actually reset user schedule if they have missed deadlines and not missed any gated content deadlines

This reverts commit c3ec8b83, reversing
changes made to 4252b149.

Only prompt to upgrade in order to completed graded content (or shift dates) when content_type_gating is enabled

On mobile dates banner, distinguish between the missed-deadlines and no-missed-deadlines case on the dates page

Separate out various boolean values in the dates_banner.html in order to make it easier to reference them

- use new dates banner template on course outline page
- remove old banner from main.html
- let dates tab use new dates banner template
- remove dates banner completely from the courseware problem view
  on the web app
- use new banner on the courseware problem view on the mobile app
- update banner util to use get_course_blocks