ESlint new configuration file format.

[PieterPaulussen]

Is your feature request related to a problem?
Yes, the ESLint configuration file has been refactored into a new format. See here. From version 9.3.0, the old format is no longer supported.

Describe the solution you'd like
The template ESLint file should be refactored / converted into the new ESLint 9.3.0 format.

Describe alternatives you've considered
None

[sbidoul]

This has been done 18.0 branches.