Mark apex_test.skip_validations

We want to run validations even for test apexes. But some test apexes
are *invalid* for testing purpose. Mark them explicitly.

Bug: 363090062
Test: mmma system/apex
Change-Id: I88fcc4845ec73768bafb76fc6e1afd4d8815f251
diff --git a/tests/testdata/vendorapex/Android.bp b/tests/testdata/vendorapex/Android.bp
index 26b4432..c3bee5c 100644
--- a/tests/testdata/vendorapex/Android.bp
+++ b/tests/testdata/vendorapex/Android.bp
@@ -70,6 +70,9 @@
     binaries: [
         "apex_vendor_foo_test_binary",
     ],
+    skip_validations: {
+        apex_sepolicy_tests: true, // we don't have a valid label for the test binary
+    },
 }
 
 cc_binary {