Add rules for JSON file formatting in eslint

[offtherailz]

Description

• Reformat all the JSON files (also deprecating some hardly understandable things like "strings or object format" in localConfig.json plugin)
• Update eslint config to enforce JSON files formatting

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information

[MV88]

@offtherailz currently eslint rules are ignored as explained in the following PR description
so if you want to do this, i suggest to take a decision on this

• Proposal to enhance eslint config, plus fixing current configuration #9188

[MV88]

blocked by #9190