Support quoting.snowflake_ignore_case

[aksestok]

Resolves #11882.

I couldn't for the life of me get flake8 or mypy to run in pre-commit, but they did run successfully outside of the pre-commit context.

Problem

dbt Fusion users can't set quoting.snowflake_ignore_case in their project files if they also use dbt core.

Solution

Implements the proposed solution in #11882.

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 91.91%. Comparing base (9bc7333) to head (0f05fdf).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11942      +/-   ##
==========================================
+ Coverage   91.85%   91.91%   +0.05%     
==========================================
  Files         199      199              
  Lines       24363    24404      +41     
==========================================
+ Hits        22379    22431      +52     
+ Misses       1984     1973      -11     

Flag	Coverage Δ
integration	88.74% <100.00%> (+0.02%)	⬆️
unit	65.32% <100.00%> (+0.06%)	⬆️

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Components	Coverage Δ
Unit Tests	65.32% <100.00%> (+0.06%)	⬆️
Integration Tests	88.74% <100.00%> (+0.02%)	⬆️

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[MichelleArk]

Looks great! I've validated this fix locally.

Only note is to revert the changes to the jsonschemas prior to merging to avoid merge conflicts.