Cleanup python version properties

Now that python 2 is fully removed, there's no need for
version-specific properties. Remove them.

Also remove usages of embedded_launcher: true, as that
is the new default value.

Bug: 399954452
Test: Presubmits
Change-Id: I7836bc5fe794096a27d5bcf9630f598b6bc41c8a

net/test/Android.bp

diff --git a/net/test/Android.bp b/net/test/Android.bp
index fe063ee..35e8a26 100644
--- a/net/test/Android.bp
+++ b/net/test/Android.bp
@@ -15,11 +15,6 @@
         "scapy",
     ],
     main: "all_tests.py",
-    version: {
-        py3: {
-            embedded_launcher: true,
-        },
-    },
     test_config: "vts_kernel_net_tests.xml",
     test_suites: [
         "vts",
@@ -39,10 +34,5 @@
         "scapy",
     ],
     main: "all_tests_gki.py",
-    version: {
-        py3: {
-            embedded_launcher: true,
-        },
-    },
     test_config: "vts_kernel_net_tests.xml",
 }