enable ruff rule: unused-import (F401)

[RayBB]

PR here: #9182

Problem

I noticed we have quite a few instances of unused imports in our python code. Perhaps some have side effects but many do not appear to have any side effects.

I think it would be good hygiene for our codebase to enable ruff to unused imports and disable it per line as needed.

Evidence / Screenshot

Relevant URL(s)

https://docs.astral.sh/ruff/rules/unused-import/

Reproducing the bug

1. Go to ...
2. Do ...

• Expected behavior:
• Actual behavior:

Context

• Browser (Chrome, Safari, Firefox, etc):
• OS (Windows, Mac, etc):
• Logged in (Y/N): Y
• Environment (prod, dev, local): prod

Notes from this Issue's Lead

Proposal & constraints

Related files

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