chore: Update lint configuration (ESLint 9, Prettier 3)

[jhildenbiddle]

Summary

No functional changes. This PR contains updates to our lint-related dev dependencies and a number of file resulting from the updated lint tools and configuration.

• Update ESLint from v8 to v9
• Update Prettier from v2 to v3
• Migrate ESLint configuration to new flat configuration format
• Remove deprecated ESLint rules
• Remove ESLint rules from config that match default values
• Remove eslint-plugin-import (no ESLint v9 support)
• Fix lint issues throughout repo

Related issue, if any:

N/A

What kind of change does this PR introduce?

Build-related changes

For any code change,

• [ ] Related documentation has been updated, if needed
• [x] Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

No

Tested in the following browsers:

• [x] Chrome
• [x] Firefox
• [x] Safari
• [x] Edge

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 27, 2024 6:19am

[jhildenbiddle]

@Koooooo-7 --

Just trying to keep things moving! Thanks for the quick review and helpful input. Much appreciated. :)

[jhildenbiddle]

Thanks @trusktr for the quick follow-up after last week's review. Much appreciated! 🙏