Allow user staging via setting (#5468)

script/import_scripts/mbox/importer.rb

@@ -64,7 +64,7 @@ module ImportScripts::Mbox
             email: row['email'],
             name: row['name'],
             trust_level: @settings.trust_level,
-            staged: true,
+            staged: @settings.staged,
             active: false,
             created_at: to_time(row['date_of_first_message'])
           }

script/import_scripts/mbox/settings.yml

@@ -8,3 +8,4 @@ split_regex: ""
 
 default_trust_level: 1
 prefer_html: false
+staged: true

script/import_scripts/mbox/support/settings.rb

@@ -12,6 +12,7 @@ module ImportScripts::Mbox
     attr_reader :batch_size
     attr_reader :trust_level
     attr_reader :prefer_html
+    attr_reader :staged
 
     def initialize(yaml)
       @data_dir = yaml['data_dir']
@@ -19,6 +20,7 @@ module ImportScripts::Mbox
       @batch_size = 1000 # no need to make this actually configurable at the moment
       @trust_level = yaml['default_trust_level']
       @prefer_html = yaml['prefer_html']
+      @staged = yaml['staged']
     end
   end
 end