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

public/app/plugins/datasource/loki/syntax.ts

@@ -1,6 +1,8 @@
+import { Grammar } from 'prismjs';
+
 /* tslint:disable max-line-length */
 
-const tokenizer = {
+const tokenizer: Grammar = {
   comment: {
     pattern: /(^|[^\n])#.*/,
     lookbehind: true,