This makes the merge requests state exportable which allows for
other components to import and use the state.
Whenever a polling request gets returned from the widget
we update the state globally which allows for other components
to react accordingly.

For example, when a user merges a merge request
the global state gets updated which updates the status box
and also updates the comment box to stop users
from commenting and closing a merge request.
This same interaction happens when a user clicks on comment and
close. The rest of the page updates and sets it into the correct state.

To handle this we export the state from the status box component
and also export a update method. This update event should get
called whenever the state of the page should be changed.
When this method gets called we send a GraphQL request to get the correct
state of the page.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/328547