ci: Remove noxfile and add shell script for formatting

[holtskinner]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @holtskinner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the project's code formatting process by migrating from Nox to a direct shell script. This change simplifies the dependency chain for formatting, makes the process more transparent, and updates all relevant documentation and configuration to reflect the new approach.

Highlights

• CI/CD Tooling Migration: I've removed the noxfile.py which previously managed formatting tasks, replacing it with a new scripts/format.sh shell script. This simplifies the CI/CD setup for code formatting.
• Developer Workflow Update: The pull request template has been updated to guide developers to use the new bash scripts/format.sh command for local formatting, ensuring consistency with the new CI approach.
• Configuration Cleanup: I've updated various configuration files (.coveragerc, .github/actions/spelling/excludes.txt, .ruff.toml) to remove references to the now-deleted noxfile.py.
• Dependency Management: The pyproject.toml file has been updated to explicitly list formatting tools (pyupgrade, autoflake, no_implicit_optional) as development dependencies, which were previously implicitly managed by Nox.

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[gemini-code-assist]

Code Review

This pull request replaces nox for formatting tasks with a new bash script, scripts/format.sh. The changes across various configuration files are consistent with this goal. The review focuses on improving the new shell script's robustness and maintainability.