Revert "chore: Upgrade Rails to 7.2.2 and update Gemfile dependencies (#11037)"

This reverts commit ef6ba8aabd.

spec/mailers/administrator_notifications/shared/smtp_config_shared.rb

@@ -1,9 +1,11 @@
 # frozen_string_literal: true
 
 RSpec.shared_context 'with smtp config' do
-  around do |example|
-    # Set SMTP_ADDRESS so mailers build a Mail::Message in test without touching real SMTP.
-    # Scoped to this shared context to avoid affecting other specs.
-    with_modified_env('SMTP_ADDRESS' => 'smtp.example.com') { example.run }
+  before do
+    # We need to use allow_any_instance_of here because smtp_config_set_or_development?
+    # is defined in ApplicationMailer and needs to be stubbed for all mailer instances
+    # rubocop:disable RSpec/AnyInstance
+    allow_any_instance_of(ApplicationMailer).to receive(:smtp_config_set_or_development?).and_return(true)
+    # rubocop:enable RSpec/AnyInstance
   end
 end