Merge branch 'ld-integrations-dev-guide-remove-graphql-advice' into 'master'

Remove advice to implement integrations in GraphQL

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117974



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@gitlab.com>