Dashboard: Use Explore's Prometheus editor in dashboard panel edit (#15364)

* WIP prometheus editor same in panel

* Dont use panel in plugin editors

* prettiered modified files

* Fix step in external link

* Prevent exiting edit mode when slate suggestions are shown

* Blur behavior and $__interval variable

* Remove unused query controller

* Basic render test

* Chore: Fixes blacklisted import

* Refactor: Adds correct start and end time

public/app/plugins/datasource/prometheus/specs/language_provider.test.ts

@@ -80,12 +80,13 @@ describe('Language completion provider', () => {
       expect(result.suggestions).toMatchObject([
         {
           items: [
-            { label: '1m' },
-            { label: '5m' },
-            { label: '10m' },
-            { label: '30m' },
-            { label: '1h' },
-            { label: '1d' },
+            { label: '$__interval', sortText: '$__interval' }, // TODO: figure out why this row and sortText is needed
+            { label: '1m', sortText: '00:01:00' },
+            { label: '5m', sortText: '00:05:00' },
+            { label: '10m', sortText: '00:10:00' },
+            { label: '30m', sortText: '00:30:00' },
+            { label: '1h', sortText: '01:00:00' },
+            { label: '1d', sortText: '24:00:00' },
           ],
           label: 'Range vector',
         },