[Discover] Improve and unskip functional test of hiding the histogram #132768
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Summary
Fixing the test of hiding the histogram by adding a little mouse movement. It failed because the button to click was hidden by an overlapping popover but the button starting the search.
Flaky test runner, 100 runs: https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/662
Fixes #132288
Checklist