Remove Zephyr 7B from everywhere possible in CI

[hmellor]

tests/entrypoints/openai/test_completion.py is the exception because it has LoRA and PromptAdapters. This can also be removed once we drop PromptAdapters.

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[mgoin]

Seems reasonable to me, good if green!

[hmellor]

TinyLlama is based on an early version of Llama with max context length 2048... Lots of tests specify 8192 😭

I'll have a go at making my own LoRA based on a smaller model