[ML] Modifies script for population analysis screenshot (#146393)

This PR adjusts the screenshot automation script to take the
`ml-population-results` screenshots with swim lanes visible.

(cherry picked from commit 115c250)

x-pack/test/screenshot_creation/apps/ml_docs/anomaly_detection/population_analysis.ts

@@ -14,7 +14,6 @@ export default function ({ getService }: FtrProviderContext) {
   const elasticChart = getService('elasticChart');
   const ml = getService('ml');
   const commonScreenshots = getService('commonScreenshots');
-  const testSubjects = getService('testSubjects');
 
   const screenshotDirectories = ['ml_docs', 'anomaly_detection'];
 
@@ -85,22 +84,12 @@ export default function ({ getService }: FtrProviderContext) {
       await ml.jobTable.filterWithSearchString(populationJobConfig.job_id, 1);
       await ml.jobTable.clickOpenJobInAnomalyExplorerButton(populationJobConfig.job_id);
       await ml.commonUI.waitForMlLoadingIndicatorToDisappear();
-
-      await ml.testExecution.logTestStep('open tooltip and take screenshot');
-      const viewBySwimLanes = await testSubjects.find(viewBySwimLaneTestSubj);
-      const cells = await ml.swimLane.getCells(viewBySwimLaneTestSubj);
-      const sampleCell = cells[0];
-
-      await viewBySwimLanes.moveMouseTo({
-        xOffset: Math.floor(cellSize / 2.0),
-        yOffset: Math.floor(cellSize / 2.0),
-      });
-
       await commonScreenshots.takeScreenshot('ml-population-results', screenshotDirectories);
-
       await ml.testExecution.logTestStep(
         'select swim lane tile, expand anomaly row and take screenshot'
       );
+      const cells = await ml.swimLane.getCells(viewBySwimLaneTestSubj);
+      const sampleCell = cells[0];
       await ml.swimLane.selectSingleCell(viewBySwimLaneTestSubj, {
         x: sampleCell.x + cellSize,
         y: sampleCell.y + cellSize,