removes examples apps from coverage report

[MathiasPaulin]

• Please check if the PR fulfills these requirements
• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

Be aware that the PR request cannot be accepted if it doesn't pass the Continuous Integration tests.

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Remove example apps from coverage report so that source code of examples is not reported as not covered by tests

[codecov[bot]]

Codecov Report

Merging #991 (b1f21c9) into release-candidate (46b3969) will increase coverage by 1.98%. The diff coverage is n/a.

@@                  Coverage Diff                  @@
##           release-candidate     #991      +/-   ##
=====================================================
+ Coverage              39.93%   41.92%   +1.98%     
=====================================================
  Files                    345      324      -21     
  Lines                  22928    21740    -1188     
=====================================================
- Hits                    9157     9114      -43     
+ Misses                 13771    12626    -1145     

Impacted Files	Coverage Δ
examples/EnvMap/main.cpp
examples/DrawPrimitives/minimalradium.cpp
examples/Volume/main.cpp
examples/HelloRadium/main.cpp
...PluginsWithLib/Upstream/Library/ExampleLibrary.cpp
examples/HeadlessExample/main.cpp
examples/EntityAnimation/main.cpp
examples/SimpleAnimation/main.cpp
examples/CustomCameraManipulator/main.cpp
...mples/PluginsWithLib/Downstream/Plugin/PluginB.cpp
... and 11 more

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