Fix CI after pytest-xdist update

[maxnoe]

The new version 3.5 of pytest-xdist was released yesterday changing the order in which tests are run:

now sorts scopes by number of tests to assign largest scopes early – in many cases this should improve overall test session running time, as there is less chance of a large scope being left to be processed near the end of the session, leaving other workers idle.

This lead to the Provenance tests failing due to the nature of this singleton (it contained the provenance of all applications run prior to the provenance test) not only the ones being tested for.

Fixed by monkeypatching the provenance back to an empty state for the tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b754690) 92.47% compared to head (b0de499) 92.47%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2469   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files         234      234           
  Lines       19814    19816    +2     
=======================================
+ Hits        18323    18325    +2     
  Misses       1491     1491           

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