Evaluate replacing @rails/ujs with mrujs

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We currently use @rails/ujs for handling some client-side behaviours. This issue is about investigating mrujs as a possible replacement.

The main motivation is that it intentionally does not support JavaScript partials, which is the crux of #336138 (closed).

Other reasons in its favour:

• Mrujs strives to be a drop-in replacement for rails-ujs
• Mrujs is intended to provide an easier upgrade path from Rails 6 to Rails 7