chore(angular-server): update eslint to 8.x (#29671)

Updated `eslint` to latest 8.x and `@ionic/eslint-config` to latest
(0.4.0), which is required for eslint 8.x to work.

Removed `eslint-plugin-import` and `@typescript-eslint/eslint-plugin`
since they are part of `@ionic/eslint-config`

Author: jcesarmobile