Integration tests for grid tooltip delays are flaky

[web-padawan]

Description

Integration tests for grid tooltip delays added by #4676 are quite flaky and fail randomly. Example: https://github.com/vaadin/web-components/actions/runs/3241655226/jobs/5314013986

integration/tests/grid-tooltip.test.js:

 ❌ tooltip > should use hover delay on cell mouseenter
      AssertionError: expected true to be false
      + expected - actual
      
      -true
      +false
      
      at o.<anonymous> (integration/tests/grid-tooltip.test.js:63:33)

 ❌ tooltip > should use focus delay on cell keyboard focus
      AssertionError: expected true to be false
      + expected - actual
      
      -true
      +false
      
      at o.<anonymous> (integration/tests/grid-tooltip.test.js:136:[33](https://github.com/vaadin/web-components/actions/runs/3241655226/jobs/5314013986#step:5:34))