Removing python dependency from the manifes.json files.

TestProjects/PerceptionHDRP/Packages/manifest.json

     "com.unity.perception": "file:../../../com.unity.perception",
     "com.unity.render-pipelines.core": "10.5.1",
     "com.unity.render-pipelines.high-definition": "10.5.1",
-    "com.unity.scripting.python": "4.0.0-exp.5",
     "com.unity.simulation.capture": "0.0.10-preview.23",
     "com.unity.simulation.core": "0.0.10-preview.26",
     "com.unity.test-framework": "1.1.27",

TestProjects/PerceptionURP/Packages/manifest.json

     "com.unity.package-validation-suite": "0.21.1-preview",
     "com.unity.perception": "file:../../../com.unity.perception",
     "com.unity.render-pipelines.universal": "10.5.1",
-    "com.unity.scripting.python": "4.0.0-exp.5",
     "com.unity.simulation.capture": "0.0.10-preview.16",
     "com.unity.simulation.core": "0.0.10-preview.21",
     "com.unity.test-framework": "1.1.27",