tests: defer import of cwltool, so we can skip thoses tests to avoid a circular dependency if needed.

[mr-c]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.56%. Comparing base (e413f9b) to head (6b18726).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #377   +/-   ##
=======================================
  Coverage   34.56%   34.56%           
=======================================
  Files          30       30           
  Lines       35382    35382           
  Branches     9555     9555           
=======================================
  Hits        12231    12231           
  Misses      20266    20266           
  Partials     2885     2885           

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