Remove tools/code_check and update codecov

[chapulina]

See gazebo-tooling/action-gz-ci#32 and gazebo-tooling/release-tools#446

[codecov]

Codecov Report

Merging #321 (4ddc439) into ign-rendering3 (0a54d81) will increase coverage by 2.55%.
The diff coverage is 62.42%.

@@                Coverage Diff                 @@
##           ign-rendering3     #321      +/-   ##
==================================================
+ Coverage           50.39%   52.94%   +2.55%     
==================================================
  Files                 129      129              
  Lines               11692    11917     +225     
==================================================
+ Hits                 5892     6310     +418     
+ Misses               5800     5607     -193     

Impacted Files	Coverage Δ
include/ignition/rendering/RayQuery.hh	100.00% <ø> (ø)
include/ignition/rendering/RenderPassSystem.hh	100.00% <ø> (ø)
include/ignition/rendering/base/BaseCamera.hh	70.27% <ø> (ø)
include/ignition/rendering/base/BaseDepthCamera.hh	16.66% <ø> (ø)
include/ignition/rendering/base/BaseMarker.hh	43.24% <ø> (ø)
include/ignition/rendering/base/BaseScene.hh	0.00% <ø> (ø)
...clude/ignition/rendering/base/BaseThermalCamera.hh	94.44% <ø> (ø)
...nclude/ignition/rendering/ogre/OgreRenderEngine.hh	100.00% <ø> (ø)
ogre/src/OgreDepthCamera.cc	0.00% <0.00%> (ø)
ogre/src/OgreGpuRays.cc	0.00% <0.00%> (ø)
... and 36 more

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