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/iron/pr-1754
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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 47.27273% with 29 lines in your changes missing coverage. Please review.

Project coverage is 62.40%. Comparing base (15c9a14) to head (e9d2e82).
Report is 1 commits behind head on iron.

Files with missing lines	Patch %	Lines
controller_manager/test/test_spawner_unspawner.cpp	47.27%	0 Missing and 29 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             iron    #1839      +/-   ##
==========================================
- Coverage   62.41%   62.40%   -0.02%     
==========================================
  Files         112      112              
  Lines       12984    13039      +55     
  Branches     8782     8831      +49     
==========================================
+ Hits         8104     8137      +33     
+ Misses        952      943       -9     
- Partials     3928     3959      +31     

Flag	Coverage Δ
unittests	62.40% <47.27%> (-0.02%)	⬇️

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	70.68% <ø> (ø)
controller_manager/test/test_spawner_unspawner.cpp	56.22% <47.27%> (-1.36%)	⬇️

... and 2 files with indirect coverage changes