Remove isort dependency, migrate to ruff equivalent

[jrmccluskey]

Removes the dependency on isort in Beam Python linting checks, configuring ruff's isort-equivalent checks to mirror the old settings. This 1) makes the linting workflow even faster and 2) makes import ordering issues automatically fixable by running ruff check --fix with no configuration mismatches between pyproject.toml and the run_lint.sh script.

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[gemini-code-assist]

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