Suggestions: improve styling for new version (#114381)

* Suggestions: hashes on suggestions, update logic to select first suggestion

* fix types

* Suggestions: New UI style updates

* update some styles

* getting styles just right

* remove grouping when not on flag

* adjust minimum width for sidebar

* CI cleanups

* updates from ad hoc review

* add loading and error states to suggestions

* remove unused import

* update header ui for panel editor

* restore back button to vizpicker

* fix e2e test

* fix e2e

* add i18n update

* use new util for setVisualization operation

* Apply suggestions from code review

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* comments from review

* updates from review

---------

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

packages/grafana-e2e-selectors/src/selectors/components.ts

@@ -583,6 +583,9 @@ export const versionedComponents = {
         '11.1.0': 'data-testid Panel editor option pane content',
         [MIN_GRAFANA_VERSION]: 'Panel editor option pane content',
       },
+      header: {
+        '12.4.0': 'data-testid Panel editor OptionsPane header',
+      },
       select: {
         [MIN_GRAFANA_VERSION]: 'Panel editor option pane select',
       },