Change http basic auth for when service closed

If the service isn't open (determined via feature flag), we have a basic
auth prompt that provides some light resistance to accessing it.

This prompt is encountered regularly in local development, as the
feature flag will often be inactive (after a database reset for
example).

Change the credentials used to match other services looked after by TRA
Digital (eg - Find, AYTQ, CTR).

app/controllers/application_controller.rb

@@ -12,8 +12,8 @@ class ApplicationController < ActionController::Base
   def http_basic_authenticate
     valid_credentials = [
       {
-        username: ENV.fetch("SUPPORT_USERNAME", "support"),
-        password: ENV.fetch("SUPPORT_PASSWORD", "support")
+        username: ENV.fetch("SUPPORT_USERNAME", "test"),
+        password: ENV.fetch("SUPPORT_PASSWORD", "test")
       }
     ]