ran make upgrade, but not upgrading pytest or pytest-forked to try to isolate travis test failures

Running make upgrade again

- Dependent on https://github.com/edx/edx-enterprise/pull/429

Update version of edx-proctoring and update copy to refer to onboarding exams in Studio for proctoring backends that support onboarding exams.

The banner took up too much room with the browser
zoomed in. This adds a button to hide/show much of the copy, reducing the
portion of the page on zoomed-in desktop browsers stickily obscuring
courseware. The toggle's initial state is set according to browser
width.

update semantic structure of some proctoring banner elements

JIRA:EDUCATOR-3899

JIRA:EDUCATOR-3900

without blocking multiple concurrent sessions

also updates trace amounts of copy duplicated in tests between
edx-proctoring and edx-platform

JIRA:EDUCATOR-3931

Running make upgrade to bump edx-entprise from 1.2.3 to 1.2.5. Also, updating constraints.txt to prevent a backwards incompatible update from oauthlib