Update global ruff.toml file to include isort by default

[eirikurj]

Description

I think most of our repositories (if not all) have added ISORT: true to the ci.yaml file.

We should at some point add it to the global ruff.toml file and remove the explicit check.

A conservative plan would be something like,

• Change the default here to True. This forces repos that have not implemented this yet to work on this.
• Change the global ruff.toml file and remove the explicit check in ci.yaml.