refs #6039, closes#6047, closes#6048
- delete old/unused fixtures file
- add failing tests for #6047 & #6048
- redirect to sign-in if we get a 401 when making an API request
- fix incorrect `this.notifications` call in tag controller
- raise `authorizationFailed` action in application route's `sessionInvalidated` hook so that it can be handled by leaf routes (fixes re-auth modal display)
- close "saving failed" alert when successfully re-authenticated
- adds a "window-proxy" util so that we can override `window.*` operations in tests
- fix `gh-selectize` attempting to register event handlers when the component has already been destroyed
Closes#5450
- No longer provide the edit route a model when transitioning from the
posts list/content screen and no longer check to see if a copy of the
post already exists in the store from the model hook.
fixes#5136
- wrap notification fetch with a user role check to remove console error
- move author transition down to local route for users/user so that there's no infinite loop
- replace all store calls to fetch the current user with the session user instead
