Fix #9608: Unit test path outputs

[aranke]

resolves #9608

Problem

1. Unit test failure should include the actual compiled path of the unit test query
2. Unit test fixtures should not overwrite the compiled path for the input models

Solution

This PR makes the following changes:

1. Move input SQL fixture to target/compiled/my_model.yml/model_a.sql to prevent overwriting model at target/compiled/model_a.sql.
2. Create a RunResult out of UnitTestNode instead of UnitTestDefinition since the latter doesn't have path information.
3. Modify test TestUnitTestDuplicateTestNamesAcrossModels to check for unique_ids instead of model names in results

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/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

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.04%. Comparing base (e46eae1) to head (f2e0b0d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9793      +/-   ##
==========================================
- Coverage   88.07%   88.04%   -0.04%     
==========================================
  Files         178      178              
  Lines       22461    22457       -4     
==========================================
- Hits        19783    19772      -11     
- Misses       2678     2685       +7     

Flag	Coverage Δ
integration	85.42% <100.00%> (-0.11%)	⬇️
unit	61.72% <25.00%> (-0.01%)	⬇️

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[gshank]

Nice cleanup in the unit test parser. Looks good.