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

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