Chore: Run ConfigLoader on migrate (#1072)

We have been duplicating the config loader migration. Hence let's hook it to rake db:migrate.

config/installation_config.yml

@@ -18,3 +18,5 @@
   value: 
 - name: MAILER_SUPPORT_EMAIL
   value:
+- name: CREATE_NEW_ACCOUNT_FROM_DASHBOARD
+  value: false

lib/tasks/db_enhancements.rake

@@ -0,0 +1,5 @@
+# We are hooking config loader to run automatically everytime migration is executed
+Rake::Task['db:migrate'].enhance do
+  puts 'Loading Installation config'
+  ConfigLoader.new.process
+end