fix: correct exam entry check not called

[zacharis278]

1. Resolved issue where the exam entry check for the Proctoring software was not being executed. Seems like we missed a dispatch() call here when doing some redux refactoring a few months ago and this broke.
2. Fixes an edge case where if the backend moves to a terminated state in a way that isn't caused by a client error the frontend does not show the correct interstitial message.

2U-internal Issue: COSMO-291

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.16%. Comparing base (db51931) to head (8ed052b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   94.06%   94.16%   +0.09%     
==========================================
  Files          68       68              
  Lines        1079     1080       +1     
  Branches      295      295              
==========================================
+ Hits         1015     1017       +2     
+ Misses         59       58       -1     
  Partials        5        5              

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[alangsto]

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