set global seed for reproducibility

[bvdmitri]

Similar to ReactiveBayes/ExponentialFamilyManifolds.jl#43 but we have kldivergence in way more places, where we don't have access to StableRNG. Instead I attempt to set the seed once globally before running the tests, hoping they run in the same order every time.... at the very least its not bad to set the seed before running the tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (9dc13e6) to head (24653b1).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files          12       12           
  Lines         486      486           
=======================================
  Hits          483      483           
  Misses          3        3           

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[Nimrais]

@bvdmitri What should we do with failed test dependencies?