Switch away from deprecated Route.transitionTo

[chriskrycho]

This sets us up nicely for Ember v4, where this isn't present. It also removes an unused mixin!

[chriskrycho]

Odd, unclear why tests are failing. I will poke at this at some point Soon™; if someone else beats me to it, help welcome!

[geneukum]

TIL - per the RouterService docs:

Calling transitionTo from the Router service will cause default query parameter values to be included in the URL. This behavior is different from calling transitionTo on a route or transitionToRoute on a controller.

Adding this extra ?show=inherited query string to the expected URL seemed to get all of those tests passing again.

[chriskrycho]

Ah, yep, that would do it! Thank you!