Prior to this commit, if the Forem limitted article creation only to
admins, when a new user would sign-up their call to action was to
"Create a Post". If that new user clicked on the button, they would get
an action unauthorized error.
With this commit, the call to action for Creating a Post is hidden to
that user.
The `users/onboardings/_task_card.html.erb` is rendered as part of the
home page. The home page, due to our [EdgeCacheSafetyCheck][1], does not
allow us to access attributes of the current user (e.g. are they an
admin); which means we can't add a `if policy(Article).create` to the
HTML erb. We must instead use the [`application_policy_content_tag`][2]
as well as the [AsyncInfo][3] to help inform the
[applyApplicationPolicyToggles.js pack][4] of the conditional rendering.
Closesforem/forem#17638
Related to forem/forem-internal-eng#347
[1]:8160089f3d/app/controllers/concerns/edge_cache_safety_check.rb
[2]:8160089f3d/app/helpers/application_helper.rb (L390)
[3]:8160089f3d/app/models/async_info.rb (L52-L61)
[4]:8160089f3d/app/javascript/packs/applyApplicationPolicyToggles.js
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