fix: cors handling again for not just OPTIONS request (#10025)

CORS is notorious requires specific headers to be
handled appropriately in request and response,
using cors package as part of handlerFunc() for
options method lacks the necessary control this
package needs to add headers.

cmd/gateway-main.go

@@ -267,7 +267,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	}
 
 	httpServer := xhttp.NewServer([]string{globalCLIContext.Addr},
-		criticalErrorHandler{router}, getCert)
+		criticalErrorHandler{corsHandler(router)}, getCert)
 	httpServer.BaseContext = func(listener net.Listener) context.Context {
 		return GlobalContext
 	}