Added new_user_signups_cap to setting update service
What does this MR do?
Related to #332590 (closed)
This MR adds some logic to make NamespaceSetting#new_user_signups_cap updatable via the NamespaceSetings::UpdateService class.
Based on this design, the User cap will be a setting within the Permissions, LFS, 2FA section. Which means that, upon this form submission, handle_namespace_settings will be triggered, which will manage all updates at the namespace_settings level.
This MR is also inspired by some changes made on the recent addition of NamespaceSetting::prevent_sharing_groups_outside_hierarchy. As a result, some refactoring in some tests was done as part of this MR.
Screenshots or Screencasts (strongly suggested)
Does this MR meet the acceptance criteria?
Conformity
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This change is backwards compatible across updates, or this does not apply.
Availability and Testing
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I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.) -
I have tested this MR in all supported browsers, or it's not needed. -
I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.
Security
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The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
Security reports checked/validated by a reviewer from the AppSec team
Related to #332590 (closed)