Skip tests to unblock PR CI

[scott-routledge2]

Changes included in this PR

• Moves Iceberg DDL / dict encoding tests to Nightly to free up disk space
• Skips flakey Ollama test with TODO

Testing strategy

User facing changes

Checklist

• Pipelines passed before requesting review. To run CI you must include [run CI] in your commit message.
• I am familiar with the Contributing Guide
• I have installed + ran pre-commit hooks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.79%. Comparing base (c33fbb5) to head (ebbbc72).
⚠️ Report is 157 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #967      +/-   ##
==========================================
+ Coverage   66.68%   68.79%   +2.10%     
==========================================
  Files         186      195       +9     
  Lines       66795    67681     +886     
  Branches     9507     9627     +120     
==========================================
+ Hits        44543    46559    +2016     
+ Misses      19572    18292    -1280     
- Partials     2680     2830     +150