Move Free User Cap from Growth to Utilization

What does this MR do and why?

In https://gitlab.com/gitlab-org/gitlab/-/issues/443758+ we have agreed that migrate ownership of the free user cap feature from groupacquisition to grouputilization including deprecating the measurement_and_locking feature category and consolidating free user cap under Category:Seat Cost Management

In Move all code associated with measurement_and_l... (#456870 - closed), we outlined steps needed to migrate this feature and feature category to grouputilization. This MR relates to one of the tasks in that issue.

This MR does 3 things:

• Primarily, it moves free_user_cap/ directories under a category owned by @gitlab-org/fulfillment/utilization
• reorganizes Usage Quota and Storage Statistics categories to be closer together
• opts for @gitlab-org/fulfillment/utilization/{discipline} group owners rather than individuals

relates to #456870 (closed)

Screenshots

Master (!159769 (closed))	update-freeusercap-codeownership (!159766 (closed))