Fix entrypoint tests for embedding models

[hmellor]

Changes:

• Reduce --max-model-len to match new model
• Update compared embedding size (new model has smaller embedding dim)
• Update compared token counts (new model uses a different tokenizer)

Should fix https://buildkite.com/vllm/ci/builds/14338#01954bc1-23f7-4376-9330-118d17be22fe

[github-actions]

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