fix getOwner deprecation in frontend repo.

[stopfstedt]

example:

find and replace all instances of

import { getOwner } from '@ember/application';

with

import { getOwner } from '@ember/owner';

as an aside - I can't find this deprecation listed on Ember's Deprecation sub-site, and the Ember docs still list the deprecated import pattern in their example.
Might be good to file a ticket and patch for that while at it.

[michaelchadwick]

I don't actually get this deprecation notice with Ember 5.8.1 and Node 20.12.2.

The only places I can find that mentions this is emberjs/ember.js@03bdc4c and emberjs/ember.js#19680.