[pageObjects/visualize] use testSubjects.setValue() to avoid partial …

…input (#29903)

Fixes #29373
Fixes #29833

This flaky test is caused by the filter input box not being filled in completely. I was able to reproduce this once locally, but only after running the tests a couple times. To fix this I tried switching to the `testSubjects.setValue()` function, which focuses the input and clears its value before attempting to type into the field. This seems to have a higher success rate as I was able to run the test 40 times after making the change without a failure.

test/functional/page_objects/visualize_page.js

@@ -383,8 +383,7 @@ export function VisualizePageProvider({ getService, getPageObjects }) {
      * @param {*} aggregationId the ID if the aggregation. On Tests, it start at from 2
      */
     async setFilterAggregationValue(filterValue, filterIndex = 0, aggregationId = 2) {
-      const inputField = await testSubjects.find(`visEditorFilterInput_${aggregationId}_${filterIndex}`);
-      await inputField.type(filterValue);
+      await testSubjects.setValue(`visEditorFilterInput_${aggregationId}_${filterIndex}`, filterValue);
     }
 
     async addNewFilterAggregation() {