Add tests

[AliaBonnet]

• Added tests for FrobeniusNormalForm with non-list matrices
• Added tests for PrimaryDecomp for non-cyclic matrices

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.06%. Comparing base (4d67f77) to head (befeece).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
gap/nofoma.gi	83.33%	1 Missing ⚠️
tst/utils.g	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   90.00%   97.06%   +7.05%     
==========================================
  Files           7        7              
  Lines        1001     1022      +21     
==========================================
+ Hits          901      992      +91     
+ Misses        100       30      -70     

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