Remove reference to the nightly project
What does this MR do and why?
As part of gitlab-org/quality/engineering-productivity/team#198 (closed), the gitlab-org/quality/nightly
project has been replaced by nightly scheduled pipelines in gitlab-org/gitlab
.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.