Add organization admin integrations routes

Carla Dragorequested to merge
631219-serve-integrations-pages into main

What does this MR do and why?

Add organization admin integrations routes and refresh the route snapshot for the new /o/:organization_path/admin/settings/integrations routes from gitlab-org/gitlab!260001 (merged).

All six routes match the existing /o/:ORGANIZATION_PATH/* rule with an organizationPath claim, so no routing change or new guard is needed.

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