Partial parse yaml snapshots

[gshank]

Resolves #10903

Problem

All-yaml snapshot definitions are not handled by the existing snapshot schema file parsing code.

Solution

Handle removing snapshot nodes that are built without a SQL file.

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

Attention: Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 86.54%. Comparing base (f7b7935) to head (6653d02).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10907      +/-   ##
==========================================
- Coverage   89.15%   86.54%   -2.62%     
==========================================
  Files         183      183              
  Lines       23443    23464      +21     
==========================================
- Hits        20901    20306     -595     
- Misses       2542     3158     +616     

Flag	Coverage Δ
integration	86.54% <80.00%> (+0.10%)	⬆️
unit	?

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

Components	Coverage Δ
Unit Tests	86.54% <80.00%> (-2.62%)	⬇️
Integration Tests	86.54% <80.00%> (+0.10%)	⬆️