ci/fix(test-using-pytest): ensure hatch is always installed when needed

[Psycojoker]

Sometime in test-using-pytest CI workflow the previous job failed, for example
here,
and this line with if: always() won't be able to run because hatch is
installed in the previous step but this step might get skipped.

Self proofreading checklist

• The new code clear, easy to read and well commented.
• All new code is covered by relevant tests.

Changes

Always install hatch in this always step of the job.

How to test

Make a PR that will fail this job, for example by not respecting black or use
act to test that locally.

[Psycojoker]

@hoh this is related to your #689 PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.69%. Comparing base (02affa3) to head (3ac7244).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #690   +/-   ##
=======================================
  Coverage   62.69%   62.69%           
=======================================
  Files          69       69           
  Lines        6069     6069           
  Branches      642      642           
=======================================
  Hits         3805     3805           
  Misses       2113     2113           
  Partials      151      151           

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