Ember v5 deprecations

[Windvis]

This resolves the relevant deprecations introduced in Ember v5.

• https://deprecations.emberjs.com/v5.x/#toc_template-action
• https://deprecations.emberjs.com/v5.x/#toc_component-template-resolving
• https://deprecations.emberjs.com/v5.x/#toc_deprecate-array-prototype-extensions (I saw some cases where we assume a regular array has the prototype methods enabled)

[Windvis]

ember-data-table/addon/components/data-table.js

Line 10 in c690a39

if (this.selection === undefined) this.set('selection', []);

this.selection is either an arg or an internal array, but we're using EmberArray methods (so prototype extensions must be enabled). I don't think we can simply replace them with vanilla array equivalents since we need to mutate the array and also trigger a change.

So I think our only option is to create an ember array internally and assume the argument is one as well. Consuming apps would then have to enable the prototype extensions or create an ember array explicitly before passing it in (which is already the case at the moment).