ProcessGenerator: match Input/Output schema to ExpressionTool

[mr-c]

Changed according to common-workflow-language/common-workflow-language#962, common-workflow-language/cwl-v1.1#87, and common-workflow-language/cwl-v1.2#302

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.05%. Comparing base (dba5477) to head (9cb524d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2198      +/-   ##
==========================================
+ Coverage   85.02%   85.05%   +0.02%     
==========================================
  Files          46       46              
  Lines        8509     8509              
  Branches     1984     1984              
==========================================
+ Hits         7235     7237       +2     
+ Misses        806      803       -3     
- Partials      468      469       +1     

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[GlassOfWhiskey]

LGTM