Make java.configuration.runtimes machine-overridable

Signed-off-by: Parth <thakkarparth007@gmail.com>

Author: thakkarparth007

package.json

@@ -721,7 +721,7 @@
             "additionalProperties": false
           },
           "default": [],
-          "scope": "machine"
+          "scope": "machine-overridable"
         },
         "java.server.launchMode": {
           "type": "string",