Pipeline failing with `Yaml Invalid` error when doing doc changes

Pipeline failing with Yaml Invalid error when doing doc changes. Error:

Found errors in your .gitlab-ci.yml:
  docs lint: needs 'retrieve-tests-metadata' danger-review: needs 'retrieve-tests-metadata'

Pipeline example: https://gitlab.com/gitlab-org/gitlab/pipelines/119631499

Affected MR examples: !25607 (merged) !25604 (merged)

It's also affecting master 5446ec9d

This was caused by !24568 (merged)