NH-37575: move benchmarking to Push workflow

smoke-tests/netty-test/build.gradle.kts

@@ -1,7 +1,4 @@
-import kotlinx.serialization.json.Json
-import kotlinx.serialization.json.JsonArray
-import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.json.jsonPrimitive
+import com.jayway.jsonpath.JsonPath
 import java.net.URI
 import java.net.http.HttpClient
 import java.net.http.HttpRequest
@@ -31,7 +28,7 @@ plugins {
 
 buildscript {
   dependencies {
-    classpath("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.3")
+    classpath("com.jayway.jsonpath:json-path:2.9.0")
   }
 }
 
@@ -66,14 +63,8 @@ fun getAgentUrlFromGitRelease(): String {
     .GET().build()
 
   val httpResponse = httpClient.send(request, HttpResponse.BodyHandlers.ofString())
-  val payload = Json.decodeFromString<JsonArray>(httpResponse.body())
-
   // The latest release is assumed to be the first item in the list
-  val latest = payload[0] as JsonObject
-  val assets = latest["assets"] as JsonArray
-  val asset = assets[0] as JsonObject
-  println(asset)
-  return asset["url"]!!.jsonPrimitive.content
+  return JsonPath.parse(httpResponse.body()).read("$[0].assets[0].url")
 }
 
 application {