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/webpack/webpack.dev.js

@@ -69,10 +69,10 @@ module.exports = (env = {}) =>
               },
             },
             {
-              loader: 'tslint-loader',
+              loader: 'eslint-loader',
               options: {
-                emitErrors: true,
-                typeCheck: false,
+                emitError: true,
+                emitWarning: true,
               },
             },
           ],

scripts/webpack/webpack.prod.js

@@ -62,11 +62,11 @@ module.exports = merge(common, {
             },
           },
           {
-            loader: 'tslint-loader',
+            loader: 'eslint-loader',
             options: {
-              emitErrors: true,
-              typeCheck: false,
-            },
+              emitError: true,
+              emitWarning: true,
+            }
           },
         ],
       },