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

packages/grafana-data/tsconfig.build.json

@@ -1,4 +1,4 @@
 {
-  "extends": "./tsconfig.json",
-  "exclude": ["dist", "node_modules", "**/*.test.ts", "**/*.test.tsx"]
+  "exclude": ["dist", "node_modules", "**/*.test.ts*"],
+  "extends": "./tsconfig.json"
 }