[emu3] Fix OOM in test_model_generation_multi_image and update expected strings for A10G
- Reduce image processor resolution to 32x32 tokens (256x256 pixels) in
test_model_generation_multi_image to avoid SDPA OOM on A10G (two 64x64
images produce ~8192 tokens, requiring 8+ GiB for attention alongside
the 4-bit quantized model)
- Update ("cuda", 8) expected strings for both test_model_generation_batched
and test_model_generation_multi_image to match actual A10G outputs
- Use 200x200 image downloads consistently across all integration tests
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>