DEV: Clean up state to prevent flaky tests (#27397)

When adding custom translations for tests using `I18n.backend.store_translations`,
we need to remove the custom translations at the end of each test to
prevent the custom translations from leaking to other tests.

plugins/automation/spec/requests/admin_discourse_automation_automations_spec.rb

@@ -5,6 +5,7 @@ describe DiscourseAutomation::AdminAutomationsController do
 
   before do
     SiteSetting.discourse_automation_enabled = true
+
     I18n.backend.store_translations(
       :en,
       {
@@ -24,6 +25,8 @@ describe DiscourseAutomation::AdminAutomationsController do
     )
   end
 
+  after { I18n.backend.reload! }
+
   describe "#show" do
     context "when logged in as an admin" do
       before { sign_in(Fabricate(:admin)) }