Fix test failures when run under colcon test

[azeey]

🦟 Bug fix

Summary

colcon test wasn't working for me because the LD_LIBRARY_PATH environment variable was being overwritten.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.74%. Comparing base (eac2e69) to head (3bb6be3).
Report is 5 commits behind head on gz-transport13.

Additional details and impacted files

@@                Coverage Diff                 @@
##           gz-transport13     #483      +/-   ##
==================================================
+ Coverage           87.69%   87.74%   +0.04%     
==================================================
  Files                  59       59              
  Lines                5704     5710       +6     
==================================================
+ Hits                 5002     5010       +8     
+ Misses                702      700       -2     

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