DM-38425: Configure Ruff and fix things it found #255
Merged
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Ruff is an interesting new (and extremely fast) Python linter that replaces isort, flake8, and a whole bunch of plugins. Configure it with fairly aggressive settings but a lot of exclusions, and fix all the problems it found.
Most of these changes are converting Optional[type] to type | None. I previously was sticking with Optional in some specific cases, but given that Ruff can autofix all other uses of Union and the distinction I was drawing was very nitpicky, take this approach instead.