Add Ready to Resume Interstitial

• Add a new interstitial for exam attempts in the "ready_to_resume" state to indicate to learner that their exam attempt is ready to be resumed and to prompt the learner to resume their exam.

3.3.0: Add onboarding status view to instructor dashboard

https://github.com/edx/edx-proctoring/blob/master/CHANGELOG.rst#330---2021-02-11

3.2.1

fix: ajax call used for attempt status throws fewer 500s

3.2.0: Update grade, credit, and status email updates

This version includes the following changes:

• Update to update_attempt_status function to account for multiple attempts per exam
• Update to grade, credit, and status email updates based on multiple attempts

Add Course Onboarding Status Endpoint

• Add endpoint to return onboarding status information for users enrolled in a course.

Update the obscure_user_id to use a new django setting instead of the SECRET_KEY

This is a breaking release.
We are now using a different django setting "PROCTORING_USER_OBFUSCATION_KEY" instead of Django "SECRET_KEY" for obscuring user_id to send to proctoring provider to create exam attempts. This is to fix the production issue we are having.

2.6.7: Don't show onboarding info panel for practice exams

JIRA:MST-634

2.6.6: Update delete flow for exam attempt model

https://github.com/edx/edx-proctoring/blob/master/CHANGELOG.rst

2.6.5: Update reset interstitials

These changes align all interstitials containing a reset button to use the same flow

2.6.4: Bug fix for exam resets

Merge pull request #766 from edx/alangsto/fix_exam_reset

Bug fix for exam reset