ci: use coverpkg for accurate reporting of pkg/gnolang

[thehowl]

Supersedes #1122

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (fa8eb77) 47.84% compared to head (c62a1be) 47.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1220      +/-   ##
==========================================
- Coverage   47.84%   47.31%   -0.54%     
==========================================
  Files         369      367       -2     
  Lines       62710    61519    -1191     
==========================================
- Hits        30005    29109     -896     
+ Misses      30282    30041     -241     
+ Partials     2423     2369      -54     

see 17 files with indirect coverage changes

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[thehowl]

marking as draft until the CI is fixed

[thehowl]

current state: this PR fails the CI because running the tests with coverpkg makes them time out.

Arguably, this is something we might not even want, as we want to transition to testing pkg/gnolang with unit tests, and using these "integration tests" as a supporting feature rather than one which actually determines converage.

Closing, together with #1122, if there is a case for putting this back in do raise it in an issue/reopen one of the PRs.