Reorganize a number of our unit tests

[QMalcolm]

addresses: #9961

Problem

Our unit tests are currently in files that don’t match the modules they are testing and are in a flat directory structure.

Solution

Fully addresses:

• tests/unit/test_yaml_renderer.py
• tests/unit/test_tracking
• tests/unit/test_sql_result.py
• tests/unit/test_semantic_models.py
• tests/unit/test_selector_errors.py

Partially addresses:

• tests/unit/test_unit_test_parser.py

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.17%. Comparing base (668fe78) to head (667db08).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9972      +/-   ##
==========================================
+ Coverage   80.53%   88.17%   +7.63%     
==========================================
  Files         180      180              
  Lines       22578    22578              
==========================================
+ Hits        18184    19908    +1724     
+ Misses       4394     2670    -1724     

Flag	Coverage Δ
integration	85.55% <ø> (+5.01%)	⬆️
unit	62.08% <ø> (?)

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