Add limits for placeholder user creation
What does this MR do and why?
Add limits for placeholder user creation
During the improved user mapping, placeholder users are created during an import.
To limit the number of users records that can be created during an
import, we impose limits to the placeholder users. These limits apply
to a root namespace, and take into account plan and seat count, with
more generous limits for higher paid plans and larger number of paid
seats.
When the limit is reached, no placeholder users will be created for importers into the root namespace. Instead their imports will use the single "importer user" record that is associated with their root namespace.
#455903 (closed) #464401 (closed)
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Related to #455903 (closed)