This cop prevents you from using file in API, it points you to the
development documentation about workhorse file acceleration.

rails_helper.rb's only logic was to require
spec_helper.rb.

Use Rubocop's Include
instead of manually checking the matcher in controllers specs.

Stop checking the file location programmatically.

Moves every fixture source file from
spec/javascripts to spec/frontend

Related issue:
https://gitlab.com/gitlab-org/gitlab-ee/issues/6565

The `#reload` makes to load all objects into memory,
and the main purpose of `#reload` is to drop the association cache.

The `#reset` seems to solve exactly that case.

We also enable the rubocop that makes it mandatory

This style change enforces `return if ...` instead of
`return nil if ...` to save maintainers a few minor review points

This change allows the GitLab rails and sidekiq components to receive
tracing spans from upstream services such as Workhorse and pass these
spans on to downstream services including Gitaly and Sidekiq.

This change will also emit traces for incoming and outgoing requests
using the propagated trace information. This will allow operators and
engineers to view traces across the Workhorse, GitLab Rails, Sidekiq and
Gitaly components.

Additional intra-service instrumentation will be added in future
changes.