Switch to eslint flat config

[trivikr]

Issue

Blog post: https://eslint.org/blog/2022/08/new-config-system-part-2/

Flat config is going to be the default in eslint v9.x
https://eslint.org/blog/2023/11/whats-coming-in-eslint-9.0.0/#flat-config-now-the-default-and-has-some-changes

Docs:

• Flat config: https://eslint.org/docs/latest/use/configure/configuration-files-new
• Migration to flat config: https://eslint.org/docs/latest/use/configure/migration-guide
• typescript-eslint flat config support: https://typescript-eslint.io/blog/announcing-typescript-eslint-v7/#new-features---flat-config-support

Description

Switch to eslint flat config

Testing

CI

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[trivikr]

This work can be resumed when upgrading eslint to v9

[trivikr]

Blocked on import-js/eslint-plugin-import#2556

[trivikr]

Partially blocked on microsoft/vscode-eslint#1644

[trivikr]

Migrating to biome instead in #886

[github-actions]

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