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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[codecov-commenter]

Codecov Report

Merging #161 (4e232d8) into galactic (be7c43c) will increase coverage by 28.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           galactic     #161       +/-   ##
=============================================
+ Coverage     31.31%   59.32%   +28.01%     
=============================================
  Files            32       13       -19     
  Lines          3944     1399     -2545     
  Branches       1975      430     -1545     
=============================================
- Hits           1235      830      -405     
+ Misses         1032      362      -670     
+ Partials       1677      207     -1470     

Impacted Files	Coverage Δ
..._ws/src/eix1flkawlu/rclc/rclc/src/rclc/publisher.c
...lc_parameter/src/rclc_parameter/parameter_server.c
.../src/eix1flkawlu/rclc/rclc/test/rclc/test_init.cpp
...c_parameter/test/rclc_parameter/test_parameter.cpp
...1flkawlu/rclc/rclc/test/rclc/test_subscription.cpp
ros_ws/src/eix1flkawlu/rclc/rclc/src/rclc/sleep.c
...lkawlu/rclc/rclc_lifecycle/test/test_lifecycle.cpp
...lu/rclc/rclc_examples/src/example_lifecycle_node.c
...kawlu/rclc/rclc_examples/src/example_sub_context.c
...kawlu/rclc/rclc/test/rclc/test_executor_handle.cpp
... and 35 more

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