Prefer `RSpec.describe` over `describe` in top-level namespace
### Problem The GitLab development docs were updated recently to prefer `RSpec.describe` over `describe` in top-level namespace. It is [referenced here in the docs](https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#general-guidelines). This is a best practice to avoid a monkey patch and will be removed in RSpec 4.0. References: - https://gitlab.com/gitlab-org/gitlab/-/issues/220018 - https://gitlab.com/gitlab-org/gitlab/-/issues/220218 ### Proposal We should update all specs to use `RSpec.describe` at the root level and disable the monkey patching going forward. See [this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/220018) for more information for how this was accomplished in GL.
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