DM-43225: Save stack versions in QuantumGraph.

[MichelleGower]

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.40%. Comparing base (7c47f2a) to head (83de5ef).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #406      +/-   ##
==========================================
+ Coverage   82.36%   82.40%   +0.04%     
==========================================
  Files          93       93              
  Lines       10645    10647       +2     
  Branches     2021     2020       -1     
==========================================
+ Hits         8768     8774       +6     
+ Misses       1521     1519       -2     
+ Partials      356      354       -2     

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[natelust]

I think what you wrote is fine, but if you are now going to always be adding to the metadata now may I suggest:

self._metadata = dict(metadata) if metadata is not None else {}
Self._metadata[‘packages’] = Packages.fromSystem()

Fewer round trips and copies being made.