checks for random_gaussian_matrix

[scarrazza]

This fixes tests failing when using qibojit with import-AOT compilation disabled.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.51%. Comparing base (4815b7a) to head (71735bb).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1804   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          79       79           
  Lines       13274    13282    +8     
=======================================
+ Hits        13210    13218    +8     
  Misses         64       64           

Flag	Coverage Δ
unittests	99.51% <100.00%> (+<0.01%)	⬆️

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