[Lens][Security Solutions] Restore cypress tests (elastic#206025)

## Summary

Fixes elastic#198756 


### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

x-pack/test/security_solution_cypress/cypress/e2e/investigations/alerts/alerts_charts.cy.ts

@@ -103,8 +103,7 @@ describe('KPI visualizations in Alerts Page', { tags: ['@ess', '@serverless'] },
     });
   });
 
-  // For some reason this suite is failing in CI while I cannot reproduce it locally
-  context.skip('Histogram legend hover actions', () => {
+  context('Histogram legend hover actions', () => {
     it('should should add a filter in to KQL bar', () => {
       selectAlertsHistogram();
       const expectedNumberOfAlerts = 1;