OPRUN-3690: Watch for new upstream feature gate APIV1MetasHandler

refer:
* [Metas Endpoint RFC](https://docs.google.com/document/d/1s6_9IFEKGQLNh3ueH7SF4Yrx4PW9NSiNFqFIJx0pU-8/edit?usp=sharing)
* [PR that introduced metas endpoint in catalogd](operator-framework/operator-controller-1643)
* [APIV1MetasHandler naming](operator-framework/operator-controller@45cdb37#diff-03c0636b035013a21712c5f4f04a30ae71ef533c9aa4a6d0724dc5575bf0dffdR9)
* [Guide this PR followed for mapping upstream APIV1MetasHandler feature gate to downstream FeatureGateNewOLMCatalogdMetas} feature gate](https://docs.google.com/document/d/1krN-4vwaE47aLRW9QjwD374-0Sh80taa_7goqVNi_-s/edit?tab=t.0#heading=h.th7069vduyim)

Author: anik120

internal/featuregates/mapper.go

@@ -10,9 +10,12 @@ import (
 )
 
 // Add your new upstream feature gate here
-// const (
-// 		MyUpstreamFeature = "MyUpstreamFeature"
-// )
+const (
+	// ref:
+	// 1. https://github.com/operator-framework/operator-controller/pull/1643
+	// 2. https://github.com/operator-framework/operator-controller/commit/5965d5c9ee56e9077dca39afa59047ece84ed97e#diff-bfcbe63805e38aeb1d57481bd753566c7ddf58702829e1c1ffd7698bd047de67R309
+	APIV1MetasHandler = "APIV1MetasHandler"
+)
 
 type MapperInterface interface {
 	OperatorControllerUpstreamForDownstream(downstreamGate configv1.FeatureGateName) []string
@@ -34,6 +37,7 @@ func NewMapper() *Mapper {
 	}
 	catalogdGates := map[configv1.FeatureGateName][]string{
 		// features.FeatureGateNewOLMMyDownstreamFeature: {MyUpstreamCatalogdFeature}
+		features.FeatureGateNewOLMCatalogdMetas: {APIV1MetasHandler},
 	}
 
 	for _, m := range []map[configv1.FeatureGateName][]string{operatorControllerGates, catalogdGates} {