[plugin-web-app-playwright] Add scrolling steps

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.46%. Comparing base (aefee43) to head (184a4fc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5199 +/- ## ========================================= Coverage 97.46% 97.46% - Complexity 6795 6823 +28 ========================================= Files 938 943 +5 Lines 19649 19717 +68 Branches 1305 1304 -1 ========================================= + Hits 19150 19218 +68 Misses 390 390 Partials 109 109 ```

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