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

public/app/plugins/datasource/cloudwatch/components/QueryEditor.test.tsx

@@ -42,7 +42,7 @@ const setup = () => {
       namespace: 'ec2',
       metricName: 'CPUUtilization',
       dimensions: { somekey: 'somevalue' },
-      statistics: new Array<string>(),
+      statistics: [],
       period: '',
       expression: '',
       alias: '',