Functional test that demonstrates bug behavior: "dbt found two macros named X"

[dbeatty10]

Resolves #4233

Note

This PR only contains a test case that exhibits the bug. It does not actually solve the bug currently. However, this test case can be used for TDD.

Problem

Solution

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 86.35%. Comparing base (e2e86b7) to head (514b26d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11476      +/-   ##
==========================================
- Coverage   88.91%   86.35%   -2.57%     
==========================================
  Files         194      194              
  Lines       24553    24553              
==========================================
- Hits        21832    21202     -630     
- Misses       2721     3351     +630     

Flag	Coverage Δ
integration	82.49% <ø> (-3.50%)	⬇️
unit	62.77% <ø> (+0.03%)	⬆️

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Components	Coverage Δ
Unit Tests	62.77% <ø> (+0.03%)	⬆️
Integration Tests	82.49% <ø> (-3.50%)	⬇️

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