Add test coverage for params_file parameter in spawner/unspawner tests (backport #1754)

[mergify]

Overview

• Solve Add tests to the params_file parameter in test_spawner_unspawner.cpp #1702
• This PR adds test cases for the params_file parameter in the test_spawner_unspawner.cpp.

---

This is an automatic backport of pull request #1754 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 84e85f9 has failed:

On branch mergify/bp/humble/pr-1754
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 84e85f9.
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Unmerged paths:
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	both modified:   controller_manager/test/test_spawner_unspawner.cpp

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

This pull request is in conflict. Could you fix it @bmagyar @destogl @christophfroehlich @saikishor?

[codecov]

Codecov Report

Attention: Patch coverage is 50.84746% with 29 lines in your changes missing coverage. Please review.

Project coverage is 62.54%. Comparing base (d62377e) to head (2c9c690).
Report is 1 commits behind head on humble.

Files with missing lines	Patch %	Lines
controller_manager/test/test_spawner_unspawner.cpp	50.84%	0 Missing and 29 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1838      +/-   ##
==========================================
- Coverage   62.57%   62.54%   -0.04%     
==========================================
  Files         108      108              
  Lines       12041    12097      +56     
  Branches     8145     8194      +49     
==========================================
+ Hits         7535     7566      +31     
+ Misses        882      877       -5     
- Partials     3624     3654      +30     

Flag	Coverage Δ
unittests	62.54% <50.84%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../controller_manager/controller_manager_services.py	72.41% <ø> (ø)
controller_manager/test/test_spawner_unspawner.cpp	57.39% <50.84%> (-1.50%)	⬇️

... and 1 file with indirect coverage changes