Context of this change:
There are two site settings which an admin can configured to set the
default categories and tags that are shown for a new user. `default_navigation_menu_categories`
is used to determine the default categories while
`default_navigation_menu_tags` is used to determine the default tags.
Prior to this change when seeding the defaults, we will filter out the
categories/tags that the user do not have permission to see. However,
this means that when the user does eventually gain permission down the
line, the default categories and tags do not appear.
What does this change do?
With this commit, we have changed it such that all the categories and tags
configured in the `default_navigation_menu_categories` and
`default_navigation_menu_tags` site settings are seeded regardless of
whether the user's visibility of the categories or tags. During
serialization, we will then filter out the categories and tags which the
user does not have visibility of.
The centralization helps in reducing code duplication in our code base
and more importantly, centralizing logic for guardian checks into a
single spot.
