Use new expected proxy configs to hit New Relic API.

app-config.yaml

@@ -34,6 +34,12 @@ proxy:
         $env: TRAVISCI_AUTH_TOKEN
       travis-api-version: 3
 
+  '/newrelic/apm/api':
+    target: https://api.newrelic.com/v2
+    headers:
+      X-Api-Key:
+        $env: NEW_RELIC_REST_API_KEY
+
 organization:
   name: Spotify
 
@@ -51,11 +57,6 @@ rollbar:
   accountToken:
     $env: ROLLBAR_ACCOUNT_TOKEN
 
-newrelic:
-  api:
-    baseUrl: 'https://api.newrelic.com/v2'
-    key: NEW_RELIC_REST_API_KEY
-
 lighthouse:
   baseUrl: http://localhost:3003