Make upgrade to get the latest edx-when (1.1.3)

Also pinned httpretty < 1.0 because that upgrade broke many tests.

Unpin edx-when

AA-38 calendar sync email template

- create templates and methods to build/send calendar sync emails.

Revert "Revert "Upgrade edx-when to read XBlock dates out of the read-replica""

MST-157 Part 3 Create the Program Enrollments Inspector tool UI and link to the Support tool index page

Temporarily pin edx-when version

Added 'show calculator' to courseware metadata

Logs cleanup

Get rid of 2 flaky a11y tests.

Revert "Upgrade edx-when to read XBlock dates out of the read-replica"

Issue: https://openedx.atlassian.net/browse/BOM-1404



* Fixed Django 2.x installation process in tox
* Updated xdist worker Django installation code
* Use correct tox environment variable name

Co-authored-by: Jeremy Bowman <jbowman@edx.org>

Upgrade edx-when to read XBlock dates out of the read-replica

Upgrade edx-when and edx-django-utils for better database usage

ENT-2580 | added sleep of 1 second in create_orders_for_old_enterprise_course_en…

added sleep of 1 second in create_orders_for_old_enterprise_course_enrollment command so that we should not hit ecommerce API more that 60 calls per minute.

TNL-7000

Fix Blockstore XBlock Runtime's handling of occasional S3 errors (take 2)

Python Requirements Update

AA-81: Update edx-when version

Reducing play button opacity to improve viewing experience.