chore: upgrade to eslint v9

[michaelhthomas]

Description

It's always good to be on the newest versions of tools. While ESLint v10 is out now, some plugins aren't yet compatible. But getting off the deprecated ESLint v8 and upgrading to the new configuration format is desirable nonetheless.

The new versions of ESLint have a new config file format, so some manual migration is required. Also, newer versions of plugins have additional / fixed rules, so there are some fixes to conform with those new lints.

How Has This Been Tested?

Lint passes

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

Fixes #2645

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[github-actions]

This pull request has merge conflicts. Please resolve the conflicts so the PR can be successfully reviewed and merged.