chore: Fixes flaky flashbar test

[pan-kot]

Description

The flashbar test is flaky and fails occasionally in GitHub actions. That seems to be related to the scrolling not being completed. The nature of the test allows to repeat the scrolling action and assertion until it completes w/o sacrificing coverage.

How has this been tested?

Tested by running the test over 100 times with GitHub actions - there was not a single retry.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.19%. Comparing base (62efe83) to head (e24bc64).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4234      +/-   ##
==========================================
+ Coverage   97.18%   97.19%   +0.01%     
==========================================
  Files         885      886       +1     
  Lines       25897    25996      +99     
  Branches     9362     9415      +53     
==========================================
+ Hits        25168    25267      +99     
  Misses        723      723              
  Partials        6        6              

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