Feat: Data "reset" button (#1913)

* feat: Allow admins to delete family data

* feat: Allow self-hosting users to delete cached data

* Remove system tests

app/jobs/data_cache_clear_job.rb

@@ -0,0 +1,16 @@
+class DataCacheClearJob < ApplicationJob
+  queue_as :default
+
+  def perform(family)
+    ActiveRecord::Base.transaction do
+      ExchangeRate.delete_all
+      Security::Price.delete_all
+      family.accounts.each do |account|
+        account.balances.delete_all
+        account.holdings.delete_all
+      end
+
+      family.sync_later
+    end
+  end
+end