aurweb: Do not guard metrics endpoints in aur-dev

The sandbox deployments do not have access to the vault and so we can't have them use
it.

roles/aurweb/templates/nginx.d.conf.j2

@@ -129,9 +129,11 @@ server {
     }
 
     location = /rpc/metrics {
+{% if aurweb_environment_type == 'prod' %}
         if ($http_authorization != "Bearer {{ vault_goaurrpc_metrics_token }}") {
             return 403;
         }
+{% endif %}
 
         proxy_pass http://127.0.0.1:10666/metrics;
         proxy_set_header X-Forwarded-For $remote_addr;
@@ -151,9 +153,11 @@ server {
     }
 
     location = /metrics {
+{% if aurweb_environment_type == 'prod' %}
         if ($http_authorization != "Bearer {{ vault_aurweb_metrics_token }}") {
             return 403;
         }
+{% endif %}
 
 {{ self.asgi_proxy() }}
     }