TSLint → ESLint (#21006)

* Alphabetized tslint and tsconfig files

* Optimized tsconfig files

* Optimized editorconfig & prettier config files

… to reduce redundancy

* Switched to @grafana/tsconfig

… and:
* de-duped options
* removed options with default values

* Fixed nasty issue with types for nested slate-react

* Replaced TSLint with ESLint

* TSLint disables → ESLint disables

… also JSHint removals, which haven’t had an affect since it was replaced with TSLint.

* Compliances for ESLint, Prettier and TypeScript

* Updated lockfile

scripts/grunt/default_task.js

@@ -11,7 +11,7 @@ module.exports = function(grunt) {
   // prettier-ignore
   grunt.registerTask('test', [
     'sasslint',
-    'tslint',
+    'eslint',
     'typecheck',
     'exec:jest',
     'no-only-tests',
@@ -19,9 +19,9 @@ module.exports = function(grunt) {
   ]);
 
   // prettier-ignore
-  grunt.registerTask('tslint', [
-    'newer:exec:tslintPackages',
-    'newer:exec:tslintRoot'
+  grunt.registerTask('eslint', [
+    'newer:exec:eslintPackages',
+    'newer:exec:eslintRoot'
   ]);
 
   // prettier-ignore

scripts/grunt/options/exec.js

@@ -2,24 +2,19 @@ module.exports = function(config, grunt) {
   'use strict';
 
   return {
-    tslintPackages: {
-      command: 'yarn workspaces run tslint',
-      src: ['packages/**/*.ts*'],
+    eslintPackages: {
+      command: 'yarn packages:lint',
     },
-    tslintRoot: {
-      command: 'yarn run tslint',
-      src: ['public/app/**/*.ts*'],
+    eslintRoot: {
+      command: 'yarn lint',
     },
     typecheckPackages: {
-      command: 'yarn workspaces run typecheck',
-      src: ['packages/**/*.ts*'],
+      command: 'yarn packages:typecheck',
     },
     typecheckRoot: {
-      command: 'yarn run typecheck',
-      src: ['public/app/**/*.ts*'],
+      command: 'yarn typecheck',
     },
-    jest: 'yarn run jest-ci',
-    webpack:
-      'node ./node_modules/webpack/bin/webpack.js --config scripts/webpack/webpack.prod.js',
+    jest: 'yarn jest-ci',
+    webpack: 'node ./node_modules/webpack/bin/webpack.js --config scripts/webpack/webpack.prod.js',
   };
 };