Update GraphQL documentation

What does this MR do and why?

Update GraphQL documentation (bundle exec rake gitlab:graphql:compile_docs) and introspection file (bundle exec rake gitlab:graphql:generate_all_introspection_schemas)

Closes gitlab-org/quality/analytics/ci-health-incidents#1284 (closed)

References

The bug was introduced by !255415 (merged)

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How to set up and validate locally

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