[Dashboard] fix Export CSV doesnt work (elastic#198547)

Closes elastic#198517

elastic#193644 refactored Dashboard
services. Part of this refactor moved `fieldFormats` from
`data.fieldFormats` to getting `fieldFormats` directly from the
fieldFormats plugin. That is because `data.fieldFormats` is marked as
deprecated. The problem is that the fieldFormats plugin was not defined
under `requiredPlugins` and thus was undefined at runtime.

### Test instructions
1) install web logs sample data
2) open web logs sample data dashboard
3) hover over "[Logs] Response Codes Over Time + Annotations" panel and
select "three dots" icon. Then select "Download CSV". Verify there are
no errors in web browser console and CSV is downloaded.

src/plugins/dashboard/kibana.jsonc

@@ -16,6 +16,7 @@
       "dataViews",
       "dataViewEditor",
       "embeddable",
+      "fieldFormats",
       "controls",
       "inspector",
       "navigation",