[CI] Split access cohort3 tests into 2 groups

[peterargue]

Access Cohort3 integration tests are flaky and take a long time to run. sometimes flakiness is caused by too much load on the test runner.

Split test into 2 to reduce runtime and see if it will make the test less flaky

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.14%. Comparing base (219660a) to head (3953304).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6839      +/-   ##
==========================================
+ Coverage   41.12%   41.14%   +0.01%     
==========================================
  Files        2107     2107              
  Lines      185330   185330              
==========================================
+ Hits        76220    76248      +28     
+ Misses     102710   102686      -24     
+ Partials     6400     6396       -4     

Flag	Coverage Δ
unittests	41.14% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.