Fix codecov to ignore unit tests and rclc_examples package (backport #155)

[mergify]

This is an automatic backport of pull request #155 done by Mergify.
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	both modified:   codecov.yml

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[codecov-commenter]

Codecov Report

Merging #162 (6e50b86) into foxy (700ea24) will increase coverage by 31.51%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             foxy     #162       +/-   ##
===========================================
+ Coverage   28.78%   60.29%   +31.51%     
===========================================
  Files          28       11       -17     
  Lines        3380     1010     -2370     
  Branches     1785      328     -1457     
===========================================
- Hits          973      609      -364     
+ Misses        892      270      -622     
+ Partials     1515      131     -1384     

Impacted Files	Coverage Δ
...bo/rclc/rclc_examples/src/example_lifecycle_node.c
...cvlbo/rclc/rclc/test/rclc/test_executor_handle.cpp
ros_ws/src/tpc7bcvlbo/rclc/rclc/src/rclc/timer.c
...rc/tpc7bcvlbo/rclc/rclc/src/rclc/executor_handle.c
...os_ws/src/tpc7bcvlbo/rclc/rclc/src/rclc/executor.c
ros_ws/src/tpc7bcvlbo/rclc/rclc/src/rclc/service.c
...rc/tpc7bcvlbo/rclc/rclc/test/rclc/test_service.cpp
ros_ws/src/tpc7bcvlbo/rclc/rclc/src/rclc/sleep.c
...s/src/tpc7bcvlbo/rclc/rclc/test/rclc/test_node.cpp
ros_ws/src/tpc7bcvlbo/rclc/rclc/src/rclc/init.c
... and 29 more

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