Resolved deprecated usage of Ember Data evented api usage
Resolved deprecated usage of Ember Data evented api usage

no issue

- https://deprecations.emberjs.com/ember-data/v3.x/#toc_evented-api-usage
- we were using the now deprecated `didCreate` and `didUpdate` events on the post model to perform controller-specific logic each time `post.save()` was called
- moved the functionality that was attached to the hook events into a `_savePost()` function and used that anywhere we were calling `post.save()`

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