CI: Always run tests with code coverage enabled (remove the coverage-disabled CI jobs)

[KristofferC]

I don't fully understand what this comment means (cc @IanButterworth) but running all tests with and without coverage seems a bit bananas so I'll check what happens if only coverage is used.

[IanButterworth]

IIRC this pre-dated JuliaLang/julia#52123 so can be removed now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.07%. Comparing base (72387f9) to head (df83b9b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1006   +/-   ##
=======================================
  Coverage   84.07%   84.07%           
=======================================
  Files           3        3           
  Lines         829      829           
=======================================
  Hits          697      697           
  Misses        132      132           

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[DilumAluthge]

IIRC this pre-dated JuliaLang/julia#52123 so can be removed now.

And indeed, the codecov/project commit status shows that the coverage on this PR is the same as the coverage on master.

So we'll be good to go here once the last CI job passes.

[DilumAluthge]

CI is all green here.

Codecov statuses are also both green here.