[ES|QL] Use the function from the editor plugin (elastic#174738)

## Summary

This is a cleanup. I realized that the fetchFieldsFromESQL function is
already exported by the editor plugin so we can use it from there rather
than duplicating the code.

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/lens/public/app_plugin/shared/edit_on_the_fly/helpers.test.ts

@@ -5,6 +5,7 @@
  * 2.0.
  */
 import { dataViewPluginMocks } from '@kbn/data-views-plugin/public/mocks';
+import { fetchFieldsFromESQL } from '@kbn/text-based-editor';
 import type { LensPluginStartDependencies } from '../../../plugin';
 import { createMockStartDependencies } from '../../../editor_frame_service/mocks';
 import {
@@ -14,7 +15,6 @@ import {
   mockAllSuggestions,
 } from '../../../mocks';
 import { suggestionsApi } from '../../../lens_suggestions_api';
-import { fetchFieldsFromESQL } from '../../../datasources/text_based/fetch_fields_from_esql';
 import { getSuggestions } from './helpers';
 
 const mockSuggestionApi = suggestionsApi as jest.Mock;
@@ -24,7 +24,7 @@ jest.mock('../../../lens_suggestions_api', () => ({
   suggestionsApi: jest.fn(() => mockAllSuggestions),
 }));
 
-jest.mock('../../../datasources/text_based/fetch_fields_from_esql', () => ({
+jest.mock('@kbn/text-based-editor', () => ({
   fetchFieldsFromESQL: jest.fn(() => {
     return {
       columns: [

x-pack/plugins/lens/public/app_plugin/shared/edit_on_the_fly/helpers.ts

@@ -7,12 +7,12 @@
 import { i18n } from '@kbn/i18n';
 import { getIndexPatternFromSQLQuery, getIndexPatternFromESQLQuery } from '@kbn/es-query';
 import type { AggregateQuery, Query, Filter } from '@kbn/es-query';
+import { fetchFieldsFromESQL } from '@kbn/text-based-editor';
 import type { DataView, DataViewSpec } from '@kbn/data-views-plugin/public';
 import type { Suggestion } from '../../../types';
 import type { TypedLensByValueInput } from '../../../embeddable/embeddable_component';
 import type { LensPluginStartDependencies } from '../../../plugin';
 import type { DatasourceMap, VisualizationMap } from '../../../types';
-import { fetchFieldsFromESQL } from '../../../datasources/text_based/fetch_fields_from_esql';
 import { suggestionsApi } from '../../../lens_suggestions_api';
 
 export const getQueryColumns = async (query: AggregateQuery, deps: LensPluginStartDependencies) => {

x-pack/plugins/lens/public/datasources/text_based/components/dimension_trigger.tsx

@@ -7,6 +7,7 @@
 
 import React, { useEffect, useState } from 'react';
 import { i18n } from '@kbn/i18n';
+import { fetchFieldsFromESQL } from '@kbn/text-based-editor';
 import { DimensionTrigger } from '@kbn/visualization-ui-components';
 import type { ExpressionsStart } from '@kbn/expressions-plugin/public';
 import type { DatasourceDimensionTriggerProps } from '../../../types';
@@ -16,7 +17,6 @@ import {
   addColumnsToCache,
   retrieveLayerColumnsFromCache,
 } from '../fieldlist_cache';
-import { fetchFieldsFromESQL } from '../fetch_fields_from_esql';
 
 export type TextBasedDimensionTrigger = DatasourceDimensionTriggerProps<TextBasedPrivateState> & {
   columnLabelMap: Record<string, string>;

x-pack/plugins/lens/tsconfig.json

@@ -103,7 +103,8 @@
     "@kbn/lens-formula-docs",
     "@kbn/visualization-utils",
     "@kbn/test-eui-helpers",
-    "@kbn/shared-ux-utility"
+    "@kbn/shared-ux-utility",
+    "@kbn/text-based-editor"
   ],
   "exclude": [
     "target/**/*"