rename erspanv6 production feature to ERSPANV6_MIRRORING

Summary:
As titled, rename erspanv6 production feature to ERSPANV6_MIRRORING

Let us explicitly capture the mirroring support in prod features. Towards enabling sflow and mirror tests as I will be adding more prod features for trunk/acl mirroring

Reviewed By: nivinl

Differential Revision: D68535242

fbshipit-source-id: ca22bafbe6c156fb071ab934f97dd580dc65d367

fboss/agent/test/agent_hw_tests/AgentMirroringScaleTests.cpp

@@ -64,12 +64,12 @@ class AgentMirroringScaleTest : public AgentHwTest {
                       value) {
       if constexpr (MirrorT::mirrorType == MirrorType::INGRESS_ERSPAN) {
         return {
-            production_features::ProductionFeature::ERSPANv6,
+            production_features::ProductionFeature::ERSPANV6_MIRRORING,
             production_features::ProductionFeature::INGRESS_MIRRORING};
       }
       if constexpr (MirrorT::mirrorType == MirrorType::EGRESS_ERSPAN) {
         return {
-            production_features::ProductionFeature::ERSPANv6,
+            production_features::ProductionFeature::ERSPANV6_MIRRORING,
             production_features::ProductionFeature::EGRESS_MIRRORING};
       }
     }

fboss/agent/test/production_features.thrift

@@ -63,8 +63,9 @@ enum ProductionFeature {
   PAUSE = 50,
   SEPARATE_INGRESS_EGRESS_BUFFER_POOL = 51,
   NIF_POLICER = 52,
-  ERSPANv6 = 53,
+  ERSPANV6_MIRRORING = 53,
   IP_IN_IP_DECAP = 54,
+
   # production feature which is present on all platforms, keep it at the end
   HW_SWITCH = 65536,
 }