Fix partial parsing bug with singular tests

[mattogburke]

Resolves #12223

Problem

The change in #12055 (backported to v1.10.14 in #12060) is missing a guard on the type of a test when attempting to partial parse.

GenericTests have attached_node attributes, but SingularTests do not.

Solution

Similar to other cases in the codebase (

dbt-core/core/dbt/parser/manifest.py

Line 1575 in cb7c4a7

if isinstance(node, GenericTestNode) and node.attached_node:

) guard the attached_node call with a check that we are dealing with GenericTests only.

I've included a test case which fails under the old code, and shows the issue is resolved by the change.

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.93%. Comparing base (bbd0780) to head (7e04309).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12224      +/-   ##
==========================================
- Coverage   92.00%   91.93%   -0.08%     
==========================================
  Files         203      203              
  Lines       24946    24965      +19     
==========================================
  Hits        22952    22952              
- Misses       1994     2013      +19     

Flag	Coverage Δ
integration	88.82% <100.00%> (-0.14%)	⬇️
unit	65.18% <50.00%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	65.18% <50.00%> (+0.12%)	⬆️
Integration Tests	88.82% <100.00%> (-0.14%)	⬇️

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[MichelleArk]

Thank you for this contribution!