use different eslint config for es6 and es5 (#11794)

* use different eslint config for es6 and es5

* remove confusing eslint/baseConfig.js & add more eslint setting for es5, es6

* more clear way to run eslint on es5 & es6 file

* seperate ESNext, ES6, ES6 path, and use different lint config

* rename eslint config file & update eslint rules

* Undo yarn.lock changes

* Rename a file

* Remove unnecessary exceptions

* Refactor a little bit

* Refactor and tweak the logic

* Minor issues