tests: fix split-count and shape assertions after CDN image replacement
- aria: 64x64 input produces 1 tile with split_image=True (not 2)
- idefics3/smolvlm: 64x64 square images → 4x4 split (17 tiles: 16+global)
not 1x1; update batch shapes (2,4,...) → (2,34,...); update all
get_split_image_expected_tokens calls from (3,4)/(4,4)/(1,1) → (4,4)
- videoprism: print actual pixel slice so golden values can be updated
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>