ci: don't test verbosely

[thehowl]

Let's remove the noise in the tests. This will make sure the logs only show the errors when they happen.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.36%. Comparing base (603f6d3) to head (be3ca9c).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3026      +/-   ##
==========================================
- Coverage   63.38%   63.36%   -0.03%     
==========================================
  Files         566      566              
  Lines       79490    79490              
==========================================
- Hits        50388    50369      -19     
- Misses      25710    25731      +21     
+ Partials     3392     3390       -2     

Flag	Coverage Δ
contribs/gnodev	59.94% <ø> (-0.63%)	⬇️
contribs/gnofaucet	15.77% <ø> (+0.94%)	⬆️
gno.land	67.37% <ø> (ø)
gnovm	67.87% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.41% <ø> (-0.06%)	⬇️

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[thehowl]

Note; this will only concern go tests for now. For Gno, it may still be useful for us to see the verbose output (in case of weird behaviours, etc.); let's consider those at another time