feat: update to eslint 9 and node 20

[Julusian]

About the Contributor

This pull request is posted on behalf of the BBC

Type of Contribution

This is a: Feature

Current Behavior

New Behavior

Updates eslint config to be for v9.
This required a large rewrite of the config convert it to the new flat-config structure.
To make sure this worked, I refined the config while building new config files inside sofie-core. There are some new failures due to new rules, but not ridiculous amounts of them or any rules which look misconfigured.

Updates required typescript to latest (5.7.3)

Updated typescript-eslint to latest, resuliting in a bunch of new/renamed/refined rules. This causes a bunch of linter failures that will need tackling per project when updating.

Various tools which were dependencies are now peerDependencies.
This is because yarn 4 does not allow them to be invoked easily, requiring workaround to do so. This now avoids that as it is expected that consumers can install the ones they need and invoke them. Most of these required configs setting up anyway, so shouldn't add much extra maintainance.

Prettier is updated to v3, resulting in some formatting changes, that cause a lot of linter errors.

Testing Instructions

Other Information

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.