Revert the addition of goldiloader
This reverts the addition of the "goldiloader" Gem and all use of it. While this Gem is very promising it's causing a variety of problems on GitLab.com due to it eager-loading too much data in places where we don't expect/can handle this. At least for the time being this means we have to go back to manually fixing N+1 query problems, but at least those should not cause a negative impact on availability.
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