Account namespace updates: part 5 (valuations) (#901)

* Move Valuation to Account namespace

* Move account history to controller

* Clean up valuation controller and views

* Translations and cleanup

* Remove unused scopes and methods

* Pass brakeman

db/migrate/20240620221801_rename_valuation_table.rb

@@ -0,0 +1,5 @@
+class RenameValuationTable < ActiveRecord::Migration[7.2]
+  def change
+    rename_table :valuations, :account_valuations
+  end
+end