Let subgroups override "Prevent project forking outside current group" setting of top-level namespace

Release notes

Problem to solve

For some organizations, this top-level-only group setting is too restrictive, as different sub-departments within a GitLab.com namespace want to enact different workflows and inner-sourcing strategies. Requested by a Gold customer (internal ticket).

Proposal

Make the existing top-level setting adjustable for sub-groups.

Intended users

Personas are described at https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/

Feature Usage Metrics

% of non-top-level groups that use the settings, and to a different value than the top-level.

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Edited by Katrin Leinweber