Feature Request - Configurable GraphQL limits for self hosted instances

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Feature proposal

Add configurable settings for GraphQL's Max Query Size and Max Query Complexity for self-hosted Omnibus Gitlab. I have a case where I would want to use a single command to bulk assign projects to runners due to our internal process needs.

Zendesk Ticket - internal only

Implementation proposal

Replace the following GraphQL limits with configurable application settings:

• the 5 constants
• the default max page size, validation max errors and validation timeout settings.

Update the /admin/application_settings/network page of the Admin Settings with a new section for updating these GraphQL limits.

Add documentation of new settings to a new subpage of https://docs.gitlab.com/ee/administration/settings. We should also update the docs navigation with the new docs subpage.

Resources:

• https://docs.gitlab.com/ee/development/application_settings.html
• https://docs.gitlab.com/ee/development/documentation/site_architecture/global_nav.html