Allow CSV imports to be configured with single or multi-account mode (#1943)

* Allow CSV imports to be configured to a single account or multiple accounts

* Initialize import directly from accounts page

* Fix brakeman warnings

* Fix schema

* Fix Synth check

app/controllers/import/confirms_controller.rb

@@ -4,6 +4,10 @@ class Import::ConfirmsController < ApplicationController
   before_action :set_import
 
   def show
+    if @import.mapping_steps.empty?
+      return redirect_to import_path(@import)
+    end
+
     redirect_to import_clean_path(@import), alert: "You have invalid data, please edit until all errors are resolved" unless @import.cleaned?
   end
 

app/controllers/import/uploads_controller.rb

@@ -8,6 +8,7 @@ class Import::UploadsController < ApplicationController
 
   def update
     if csv_valid?(csv_str)
+      @import.account = Current.family.accounts.find_by(id: params.dig(:import, :account_id))
       @import.assign_attributes(raw_file_str: csv_str, col_sep: upload_params[:col_sep])
       @import.save!(validate: false)