Plugins: Remove deprecated grafana-toolkit (#73489)

* remove grafana-toolkit

* replaces old tsconfig with grafana tsconfig

* fix betterer

.github/renovate.json5

@@ -18,7 +18,7 @@
     "ora", // we should bump this once we move to esm modules
   ],
   "includePaths": ["package.json", "packages/**"],
-  "ignorePaths": ["packages/grafana-toolkit/package.json", "emails/**", "plugins-bundled/**", "**/mocks/**"],
+  "ignorePaths": ["emails/**", "plugins-bundled/**", "**/mocks/**"],
   "labels": ["area/frontend", "dependencies", "no-backport", "no-changelog"],
   "packageRules": [
     {