DM-40254: Expand output of --show=graph option

[andy-slac]

The output now includes more complete information about dataset refs and also their related datastore records if they appear in the quantum graph.

Checklist

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

[codecov]

Codecov Report

Patch coverage: 59.09% and project coverage change: -0.18% ⚠️

Comparison is base (1408350) 85.51% compared to head (2d595cf) 85.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
- Coverage   85.51%   85.34%   -0.18%     
==========================================
  Files          47       47              
  Lines        4247     4259      +12     
  Branches      732      735       +3     
==========================================
+ Hits         3632     3635       +3     
- Misses        461      468       +7     
- Partials      154      156       +2     

Files Changed	Coverage Δ
python/lsst/ctrl/mpexec/showInfo.py	74.73% <59.09%> (-3.43%)	⬇️

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