ESLint - enable pipeline and fix errors

Done for the 2.0.x-dev branch, I had to put a lot of exceptions in the .eslintrc.json because the fluid library doesn't like the alterations when loading the library from the fluidui_load.js file.
I'll merge this to 2.0.x and then repeat the same process for the 3.0.x branch.

Fixed in the 3.0.x branch as well: https://git.drupalcode.org/project/fluidui/-/pipelines/433401

I'll move this issue to RTBC and then if you guys don't mind, move it to "Fixed"

Automatically closed - issue fixed for 2 weeks with no activity.