DM-52738: Add '--show inputs' option to 'pipetask build'.

[TallJimbo]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.04%. Comparing base (ce79fef) to head (e7bc918).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/mpexec/showInfo.py	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   85.99%   86.04%   +0.04%     
==========================================
  Files          44       44              
  Lines        2557     2565       +8     
  Branches      265      267       +2     
==========================================
+ Hits         2199     2207       +8     
  Misses        256      256              
  Partials      102      102              

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