Follow up from d3f02a1270
This commit fixes post quoting so that if the new
hashtag-cooked HTML is selected, we convert back to
a regular plain text #hashtag with the correct type and ref.
Given this html:
```
<aside class="quote no-group">
<blockquote>
<aside class="quote no-group">
<blockquote>
<p dir="ltr">test</p>
</blockquote>
</aside>
<p dir="ltr">test2</p>
</blockquote>
</aside>
```
The result was an invalid markdown:
```
[quote]
[quote]
> test
> [/quote]
>
>
>
> test2
[/quote]
```
Now the result is:
```
[quote]
[quote]
test
[/quote]
test2
[/quote]
```
Using arrow functions changes `this` context, which is undesired in tests, e.g. it makes it impossible to setup things like pretender (`this.server`) in `beforeEach` hooks.
Ember guides always use classic functions in examples (e.g. https://guides.emberjs.com/release/testing/test-types/), and that's what it uses in its own test suite, as do various addons and ember apps.
It was also already used in Discourse where `this` was required. Moving forward, it will be needed in more places as we migrate toward ember-cli.
(I might later add a custom rule to eslint-discourse-ember to enforce this)
We used many global functions to handle tests when they should be
imported like other libraries in our application. This also gets us
closer to the way Ember CLI prefers our tests to be laid out.
This is where they should be as far as ember is concerned. Note this is
a huge commit and we should be really careful everything continues to
work properly.
