fix: correct acs actions constant

[ilee2u]

Related to edx/edx-exams#154.

JIRA: https://2u-internal.atlassian.net/jira/software/projects/MST/boards/584?selectedIssue=MST-1961
Description

As of now, the ACS endpoint only supports a flag action. We would also like to support terminate as a way for Proctorio to communicate that they have ended an attempt.

Upon receiving a terminate request, the attempt referenced in the request should be moved to a corresponding status, depending on the reason for termination (reason_code) and incident_severity. The reason_code mappings should be clarified with Proctorio, and the incident_severity should be discussed internally to decide what range of values are considered passing.

Reason codes:

user_submission: move attempt to verified or second_review_required

error: move attempt to error

Severity:

we can just use a constant set to 0.25 for this at the moment

terminate with severity > 0.25 will move to second_review_required otherwise verified

Question: Do we want to store the reason code and incident severity in another model (similar to a review)?

work with dev on MST-1992: Return review info to exams-dashboard

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b9a0407) 97.89% compared to head (1af3d4e) 97.89%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #398   +/-   ##
=======================================
  Coverage   97.89%   97.89%           
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  Files          77       77           
  Lines        6399     6399           
=======================================
  Hits         6264     6264           
  Misses        135      135           

Flag	Coverage Δ
unittests	97.89% <100.00%> (ø)

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Files Changed	Coverage Δ
lti_consumer/lti_1p3/constants.py	100.00% <ø> (ø)
lti_consumer/__init__.py	100.00% <100.00%> (ø)

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