- Uses `helper.renderGlimmer` with GJS to render the `<Poll` component without any widgets
- Moves some logic into component, so that only `@post`, `@poll` and `@titleHTML` need to be passed into the component (no more 'attrs')
- Updates `modifyClass` calls to modern syntax
- Replaces observer in `Post` model with a native setter & tracked property
- Replaced Poll EmberObject instances with TrackedObject
- Updated component tests with new arguments
- Updated some tests to qunit-dom
- Fixed up core `repliesBelow` and `repliesAbove` logic to create post models properly. Previously it was passing 'transformed' versions of posts into the model, which doesn't make sense.
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