[Discover] Address the flaky histogram code (elastic#201809)

- Closes elastic#201744
- Similar to elastic#184600

## Summary

This PR fixes the issues with the transition from a data view without a
time field to a data view with a time field.

Previously reported error:
![management Index patterns on aliases discover verify hits should be
able to
disc-4da8c0b87362e3312cae00dc943a984acfda9af98d821decb6f48164eaca21ae](https://github.com/user-attachments/assets/652096ef-70c1-4394-a665-6b2b15d976ec)

(cherry picked from commit f50b93c)

src/plugins/unified_histogram/public/services/lens_vis_service.ts

@@ -329,8 +329,13 @@ export class LensVisService {
     queryParams: QueryParams;
     timeInterval: string | undefined;
     breakdownField: DataViewField | undefined;
-  }): Suggestion => {
+  }): Suggestion | undefined => {
     const { dataView } = queryParams;
+
+    if (!dataView.isTimeBased() || !dataView.timeFieldName) {
+      return undefined;
+    }
+
     const showBreakdown = breakdownField && fieldSupportsBreakdown(breakdownField);
 
     let columnOrder = ['date_column', 'count_column'];
@@ -343,7 +348,7 @@ export class LensVisService {
       date_column: {
         dataType: 'date',
         isBucketed: true,
-        label: dataView.timeFieldName ?? '',
+        label: dataView.timeFieldName,
         operationType: 'date_histogram',
         scale: 'interval',
         sourceField: dataView.timeFieldName,