refactor: Prune unused dependencies

[kirillbobyrev]

Python package requirements for this repository likely contain a snapshot of all installed packages in the environment, but most of the dependencies in requirements.txt (and sibling files) are unused. They can be pruned, which makes the dependency tree much leaner and alleviates the pressure from the Python package management resolver.

Additionally, some dependencies (like kaolin) are heavyweight but aren't actually used enough, so simple assertions are sufficient.

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