Remove timeline package

FunctionalTests/VR/CrossPlatform/Packages/manifest.json

@@ -7,7 +7,6 @@
     "com.unity.package-manager-ui": "2.2.0",
     "com.unity.test-framework": "1.0.14",
     "com.unity.textmeshpro": "1.3.0",
-    "com.unity.timeline": "1.0.0",
     "com.unity.xr.legacyinputhelpers": "2.0.2",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",