CWL inputs section to schema salad

[mr-c]

• move preamble to static file (or public file that gets $included?)
• tests

[codecov]

Codecov Report

Merging #1748 (c6ce1e6) into main (0f4459c) will decrease coverage by 0.36%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
- Coverage   82.17%   81.81%   -0.37%     
==========================================
  Files          47       47              
  Lines        8058     8098      +40     
  Branches     2191     2202      +11     
==========================================
+ Hits         6622     6625       +3     
- Misses        947      983      +36     
- Partials      489      490       +1     

Impacted Files	Coverage Δ
cwltool/main.py	70.86% <10.00%> (-3.44%)	⬇️
cwltool/argparser.py	95.23% <100.00%> (+0.01%)	⬆️
cwltool/load_tool.py	86.66% <100.00%> (ø)

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[mr-c]

This was a fun experiment. As explained in common-workflow-lab/galaxy#145 (comment) it is no longer needed