This allows an arbitrary Glimmer template to be rendered inside a Widget. That template can include any kind content, including Classic Ember components and Glimmer components. This leans on Ember's official `{{#in-element}}` helper which means that all component lifecycle hooks are called correctly.
This is a modern replacement for our existing `ComponentConnector` implementation. We'll deprecate `ComponentConnector` in the near future.
Example usage:
```javascript
// (inside an existing widget)
html(){
return [
new RenderGlimmer(
this,
"div.my-wrapper-class",
hbs`<MyComponent @arg1={{@data.arg1}} />`,
{
arg1: "some argument value"
}
),
]
}
```
See `widgets/render-glimmer.js` for documentation, and `render-glimmer-test` for more example uses.
The `unread_not_too_old` attribute is a little odd because there should never be a case where
the user's first_unread_at column is less than the `Topic#updated_at`
column of an unread topic. The `unread_not_too_old` attribute is causing
a bug where topic states synced into `TopicTrackingState` do not appear
as unread because the attribute does not exsist on a normal `Topic`
object and hence never set.
* Use QUnit `module` instead of `discourseModule`
* Use QUnit `test` instead of `componentTest`
* Use angle-bracket syntax
* Remove jQuery usage
* Improve assertions (and actually fix some of them)
