Update package validation version 2023.3 to 6000.0 + Add Missing Platforms

- Replaces 2023 with 6000 in package validation jobs
- Adds MacOS and Windows to package validation jobs

Author: giorgospetkakis

Tests/SRPTests/Packages/com.unity.testing.graphics-performance/package.json

@@ -2,8 +2,8 @@
   "name": "com.unity.testing.graphics-performance",
   "displayName": "Performance Graphics Tests Framework",
   "version": "17.1.0",
-  "unity": "2023.3",
-  "unityRelease": "0b9",
+  "unity": "6000.0",
+  "unityRelease": "0b13",
   "rootNamespace": "UnityEngine.TestTools.Graphics.Performance",
   "description": "Provides performance framework helpers for writing tests for graphics code, such as test scene asset description, performance performance report and shader static analysis.",
   "keywords": [