[tests] less flakiness in exercise status tests

[antoinemzs]

Proposed changes

• Add time mocks to more tests to avoid flakiness

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.77%. Comparing base (43caf1b) to head (1d78f02).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2295   +/-   ##
=========================================
  Coverage     32.77%   32.77%           
  Complexity     1517     1517           
=========================================
  Files           584      584           
  Lines         18011    18011           
  Branches       1157     1157           
=========================================
  Hits           5904     5904           
  Misses        11843    11843           
  Partials        264      264           

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