[Test][CI] Re-enable e2e model tests that are broken.

[rkooo567]

Your current environment

N/A

🐛 Describe the bug

After reenabling model tests from #3631, I found several e2e tests are broken in the matser. for the following reasons.

• allenai/OLMo-1B: TypeError: forward() got an unexpected keyword argument 'cache_position'
• mistralai/Mistral-7B-v0.1: correctness issue (generate doesn't generate any token) + RuntimeError: expected scalar type - - BFloat16 but found Half (only in CI)
• Deci/DeciLM-7b: correctness issue (output is different)
• tiiuae/falcon-7b: correctness issue (output is different)
  -"Qwen/Qwen1.5-0.5B": Correctness issue
• test_mistral.py

They are currently skipped/commented out in the master, and we should make sure to reenable it.

[rkooo567]

cc @simon-mo

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