Assert LLama Vision Image size divides by 14

[pbontrager]

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Image size must be divisible by ViT patches in the CLIP encoder, 14.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1745

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As of commit 2ac9100db09be9d37f6616a18d4fd89ab44eb0e0 with merge base 7cf656be530dfebbcc785d57d20543b3344e3352 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[joecummings]

Add a test.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.34%. Comparing base (7cf656b) to head (2ac9100). Report is 444 commits behind head on main.

Files with missing lines	Patch %	Lines
...orchtune/models/llama3_2_vision/_model_builders.py	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1745      +/-   ##
==========================================
+ Coverage   69.33%   69.34%   +0.01%     
==========================================
  Files         305      305              
  Lines       15892    15914      +22     
==========================================
+ Hits        11018    11036      +18     
- Misses       4874     4878       +4     

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