fix(graph): add decorators that ref types to graph

[dselman]

Fixes a crash with the logic to add types referenced in decorators to the graph. Updates tests to prove it works.

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Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[coveralls]

coverage: 98.767% (+0.005%) from 98.762%
when pulling d55bcbc on ds-dep-graph-decorators
into 7c9ab2b on main.