Chore: Update Slate to 0.47.8 (#18412)

* Chore: Update Slate to 0.47.8
Closes #17430

* Add slate and immutable to grafana-ui deps

* Fixes some small regressions introduced

* Fix suggestions for multiple query fields

* Pin upgraded dependencies

* Prettier fix

* Remove original slate-react dependency

* Fix tiny-invariant dep

* (Temporarily) comments out source maps for grafana-ui

tsconfig.json

@@ -31,7 +31,8 @@
     "typeRoots": ["node_modules/@types", "public/app/types"],
     "paths": {
       "app": ["app"],
-      "sass": ["sass"]
+      "sass": ["sass"],
+      "@grafana/slate-react": ["../node_modules/@types/slate-react"]
     },
     "skipLibCheck": true,
     "preserveSymlinks": true