[CI] Cleanup Dist Optim tests with shared helper funcs

[Edenzzzz]

📌 Checklist before creating the PR

• I have created an issue for this PR for traceability
• The title follows the standard format: [doc/gemini/tensor/...]: A concise description
• I have added relevant tags if possible for us to better distinguish different PRs
• I have installed pre-commit: pip install pre-commit && pre-commit install

🚨 Issue number

Link this PR to your issue with words like fixed to automatically close the linked issue upon merge

e.g. fixed #1234, closed #1234, resolved #1234

📝 What does this PR do?

Removes multiple redundant functions for ease of maintaince and code convention.

💥 Checklist before requesting a review

• I have linked my PR to an issue (instruction)
• My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
• I have performed a self-review of my code
• I have added thorough tests.
• I have added docstrings for all the functions/methods I implemented

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• 🌚 No, I don't.

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[Edenzzzz]

Tests passed locally.

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

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Tests passed locally.

[Edenzzzz]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

Tests passed locally.

@ver217 Can we fix this bot? He seems confused LOL

[Edenzzzz]

@duanjunwen Would love a review when you are not busy. Thanks!

[Edenzzzz]

@botbw Fixed test bugs and rebased to hopefully resolve the flash attn interface issue

[Edenzzzz]

@botbw CI machine error. @ver217 Actually, could we allow some contributors to automatically triggers CIs? This could also encourage contribution.