ENT-1135 Upgrade edx-enterprise to 0.72.4

Add ModelAdmin for UserRetirementPartnerReportingStatus

Primarily, this was added for convenient bulk moving of processing
states from True to False without having to incur the round-trip
duration of a devops support ticket (in which they run SQL on our
behalf).

Move pin of `gunicorn` to 2015 and run `make upgrade`

Adding more logging

exempt pdf view from xframe_options:deny

add course level mobile app exclusion for vop and cgv3 experiments

Gunicorn Change Log: http://docs.gunicorn.org/en/stable/2015-news.html

bump studio-frontend package to 1.16.5

Upgrade edx-drf-extensions to 1.6.1.

TE-2525 nose.tools removal part 1/2

Mgmt command to cancel user retirement request.

TE-2524 Remove remaining nose.plugins usage

set x_frame_option to deny in lms common env

exclude non completable blocks when calculating completion percentage

Update log for library not found

removed Grading flaky test

exempt discussion upload from xframe deny

TE-2663 Run bok-choy tests in headless Firefox

Fix visible dates sent to Credentials

TE-2524 Stop using nose.plugins - openedx

setting xframe_options to deny

Fixed typo