Updated links in metadata.textproto file (#4833)

updates the testbed configuration in the metadata.textproto file from TESTBED_DUT_ATE_2LINKS to TESTBED_DUT_ATE_4LINKS. This change correctly aligns the metadata with the test implementation, which utilizes four ports.

Author: keysightgems

feature/policy_forwarding/otg_tests/mpls_gue_ipv4_decap_scale_test/metadata.textproto

@@ -4,7 +4,7 @@
 uuid:  "01e97eb5-b01c-4d26-a1e4-8cf29d1e2245"
 plan_id:  "PF-1.20"
 description:  "MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test"
-testbed:  TESTBED_DUT_ATE_2LINKS
+testbed:  TESTBED_DUT_ATE_4LINKS
 platform_exceptions: {
   platform: {
     vendor: ARISTA
@@ -21,4 +21,4 @@ platform_exceptions: {
   static_mpls_unsupported: true
   default_network_instance: "default"
   }
-}
+}