Upload coverage for Focal builds

[chapulina]

🦟 Bug fix

Summary

When we dropped Bionic on #270 , we should have enabled test coverage for Focal. Right now we have no coverage reports on main 😬

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #284 (6ac8585) into main (ee37636) will decrease coverage by 0.65%.
The diff coverage is 66.99%.

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
- Coverage   77.08%   76.42%   -0.66%     
==========================================
  Files          75       75              
  Lines       10683    10461     -222     
==========================================
- Hits         8235     7995     -240     
- Misses       2448     2466      +18     

Impacted Files	Coverage Δ
graphics/include/ignition/common/Image.hh	97.05% <ø> (ø)
graphics/src/NodeTransform.cc	59.09% <0.00%> (ø)
include/ignition/common/Filesystem.hh	100.00% <ø> (ø)
include/ignition/common/WorkerPool.hh	100.00% <ø> (ø)
src/Timer.cc	0.00% <ø> (-60.00%)	⬇️
graphics/src/ImageHeightmap.cc	55.55% <14.28%> (-32.91%)	⬇️
src/Battery.cc	93.69% <33.33%> (-5.38%)	⬇️
graphics/src/SVGLoader.cc	86.67% <66.66%> (-0.16%)	⬇️
graphics/include/ignition/common/ImageHeightmap.hh	88.88% <88.88%> (ø)
src/URI.cc	97.12% <88.88%> (-0.29%)	⬇️
... and 17 more

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