Remove the /metrics endpoints

Now that these endpoints are provided through AQS 2.0 and the REST
gateway, we no longer need to include them as part of the RESTBase
docs, configuration, or tests.

config.frontend.test.yaml

@@ -67,8 +67,6 @@ wikimedia_project: &wikimedia_project
               - path: projects/v1/wikimedia.wmf.yaml
                 options:
                   <<: *default_options
-                  pageviews:
-                    host: https://wikimedia.org/api/rest_v1/metrics
           /{api:sys}:
             x-modules:
               - path: projects/proxy.yaml

config.fullstack.test.yaml

@@ -98,8 +98,6 @@ wikimedia_project: &wikimedia_project
               - path: projects/v1/wikimedia.wmf.yaml
                 options:
                   <<: *default_options
-                  pageviews:
-                    host: https://wikimedia.org/api/rest_v1/metrics
               - path: projects/proxy.yaml
                 options: *proxy_options
           /{api:sys}:

projects/v1/wikimedia.wmf.yaml

@@ -68,10 +68,6 @@ paths:
       - path: v1/mathoid.yaml
         options: '{{options.mathoid}}'
       - path: v1/common_schemas.yaml # Doesn't really matter where to mount it.
-  /metrics:
-    x-modules:
-      - path: v1/metrics.yaml
-        options: '{{options.pageviews}}'
   /transform:
     x-modules:
       - path: v1/transform-global.yaml