docs(js): Do not show metrics docs for deno+cordova (#15486)

Author: chargome

docs/platforms/javascript/common/metrics/index.mdx

@@ -3,6 +3,9 @@ title: Set Up Metrics
 sidebar_title: Metrics
 description: "Metrics allow you to send, view and query counters, gauges and measurements from your Sentry-configured apps to track application health and drill down into related traces, logs, and errors."
 sidebar_order: 5755
+notSupported:
+  - javascript.deno
+  - javascript.cordova
 ---
 
 With Sentry Metrics, you can send counters, gauges, distributions, and sets from your applications to Sentry. Once in Sentry, these metrics can be viewed alongside relevant errors, and searched using their individual attributes.