Add migration helpers for cascading namespace settings
Follow-up from !55678 (merged), related to #321724 (closed).
Consider creating migration helper methods that will do some of the heavy lifting associated with cascading settings.
We will need to consider how these helpers work for a completely fresh cascaded setting (does not currently exist in either namespace_settings
or application_settings
, vs a setting adapted for cascading. The latter will be more difficult to account for in a helper due to varying states an existing column could be in. Maybe we can make it work, though.