fix: better error message in tests

[mdelapenya]

What does this PR do?

It removes the error messages to be verified when copying directories into non-existing paths in a container, using a bool variable to assert for the error

Why is it important?

Fix the build

Related issues

• Completes chore: check error message in parts when testing the CreateContainerWithDirs method #576

[codecov]

Codecov Report

Merging #577 (6457d94) into main (9bee089) will decrease coverage by 19.10%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #577       +/-   ##
===========================================
- Coverage   34.50%   15.40%   -19.11%     
===========================================
  Files          13       13               
  Lines        1759     1759               
===========================================
- Hits          607      271      -336     
- Misses       1056     1442      +386     
+ Partials       96       46       -50     

Impacted Files	Coverage Δ
reaper.go	3.50% <0.00%> (-71.93%)	⬇️
mounts.go	0.00% <0.00%> (-50.00%)	⬇️
docker_mounts.go	9.75% <0.00%> (-36.59%)	⬇️
docker.go	20.33% <0.00%> (-20.94%)	⬇️
container.go	40.96% <0.00%> (-18.08%)	⬇️

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