Using working method for conda env creation.

[vitenti]

Description

Currently CI hangs on mac-os builds due to long conda solving. This PR changes the way the environment is created by recreating from scratch. This change made the conda solving much faster for the mac-os builds.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

The following checklist will make sure that you are following the code style and
guidelines of the project as described in the
contributing page.

• I have run bash pre-commit-check and fixed any issues
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have 100% test coverage for my changes (please check this after the CI system has verified the coverage)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (589fe96) to head (7d43f29).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #633     +/-   ##
=========================================
  Coverage    99.9%   100.0%             
=========================================
  Files         178      151     -27     
  Lines       13272     9057   -4215     
  Branches     1576     1035    -541     
=========================================
- Hits        13269     9057   -4212     
+ Misses          2        0      -2     
+ Partials        1        0      -1     

see 44 files with indirect coverage changes

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