Upgrade eslint to v9

[philfuster]

Eslint released version 9 a few weeks ago with some breaking changes.

One being the release of the new flat config file format that supersede the now legacy eslintrc format. This is a link to the migration guide.

Before eslint can be upgrade to v9 and the config file format migrated, all the plugins in use must support v9 of eslint.

This issue will act as a tracker for plugins support of v9 of eslint.

Plugin

Plugin Name	Current Status	Issue	Comments
eslint-plugin-import	blocked by setting up tests	eslint-plugin-import - #2948
@typescript-eslint/typescript-eslint	in progress	eslint v9 support - #8211