Loki: Fix import of escapeLabelValueInExactSelector to be from Loki (#80063)

* Loki: Fix import of escapeLabelValueInExactSelector to be from Loki

* Add test

* Update test nane

public/app/plugins/datasource/loki/components/monaco-query-field/monaco-completion-provider/CompletionDataProvider.test.ts

@@ -182,4 +182,11 @@ describe('CompletionDataProvider', () => {
   test('Returns the expected series labels', async () => {
     expect(await completionProvider.getSeriesLabels([])).toEqual(seriesLabels);
   });
+
+  test('Escapes correct characters when building stream selector in getSeriesLabels', async () => {
+    completionProvider.getSeriesLabels([{ name: 'job', op: '=', value: '"a\\b\n' }]);
+    expect(languageProvider.fetchSeriesLabels).toHaveBeenCalledWith('{job="\\"a\\\\b\\n"}', {
+      timeRange: mockTimeRange,
+    });
+  });
 });

public/app/plugins/datasource/loki/components/monaco-query-field/monaco-completion-provider/CompletionDataProvider.ts

@@ -1,9 +1,9 @@
 import { chain } from 'lodash';
 
 import { HistoryItem, TimeRange } from '@grafana/data';
-import { escapeLabelValueInExactSelector } from 'app/plugins/datasource/prometheus/language_utils';
 
 import LanguageProvider from '../../../LanguageProvider';
+import { escapeLabelValueInExactSelector } from '../../../languageUtils';
 import { ParserAndLabelKeysResult, LokiQuery } from '../../../types';
 
 import { Label } from './situation';