PR: Several fixes for the conda backend and the test suite

[ccordoba12]

• Use -y to accept changes when using conda to import an env.
• Log errors that result from running a command with subprocess.
• Remove code that it's not needed with conda 24.1.0+ and add that as our minimal supported version.
• Add packaging as a new dependency to be able to compare package versions, and flaky as a new test dependency.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.06897% with 11 lines in your changes missing coverage. Please review.

Project coverage is 83.10%. Comparing base (2f8b69a) to head (7647dd6).

Files with missing lines	Patch %	Lines
envs_manager/backends/conda_like_interface.py	40.00%	6 Missing and 3 partials ⚠️
envs_manager/tests/test_manager.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   83.61%   83.10%   -0.51%     
==========================================
  Files           7        7              
  Lines         647      663      +16     
  Branches      105       81      -24     
==========================================
+ Hits          541      551      +10     
- Misses         67       72       +5     
- Partials       39       40       +1     

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