chore: Remove unnecessary class to disable animations in tests

[jperals]

Description

Since we use the option prefers-reduced-motion at the browser level for testing, there is no need to animations and transitions via CSS as well, with the exception of the spinner component, which by design has animations even when reduced motion is set.

Document: HViwARxNHC6F

How has this been tested?

Existing integration tests.

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[bot]]

Codecov Report

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

Comparison is base (6a1404a) 94.63% compared to head (7138a94) 94.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1822   +/-   ##
=======================================
  Coverage   94.63%   94.63%           
=======================================
  Files         654      654           
  Lines       17794    17794           
  Branches     5867     5867           
=======================================
  Hits        16840    16840           
  Misses        887      887           
  Partials       67       67           

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