chore: Sync pre-chat fields after custom attribute destroy (#4456)

spec/jobs/inboxes/sync_widget_pre_chat_custom_fields_job_spec.rb

@@ -0,0 +1,26 @@
+require 'rails_helper'
+
+RSpec.describe Inboxes::SyncWidgetPreChatCustomFieldsJob, type: :job do
+  pre_chat_fields = [{
+    'label' => 'Developer Id',
+    'name' => 'developer_id'
+  }, {
+    'label' => 'Full Name',
+    'name' => 'full_name'
+  }]
+  pre_chat_message = 'Share your queries here.'
+  let!(:account) { create(:account) }
+  let!(:web_widget) do
+    create(:channel_widget, account: account, pre_chat_form_options: { pre_chat_message: pre_chat_message, pre_chat_fields: pre_chat_fields })
+  end
+
+  context 'when called' do
+    it 'reopens snoozed conversations whose snooze until has passed' do
+      described_class.perform_now(account, 'developer_id')
+      expect(web_widget.reload.pre_chat_form_options['pre_chat_fields']).to eq [{
+        'label' => 'Full Name',
+        'name' => 'full_name'
+      }]
+    end
+  end
+end