Remove test_com.android.os.statsd from apex_available

In order to simplify the apex logic in Soong, avoid needing to mention
test apexes in apex_available by setting apex_available_name in the
test apex to masquerade as the corresponding non-test apex.

Bug: 383592644
Test: builds
Change-Id: I5e3edc22e57b1938da90e459cdbcc85e5eec65e8
diff --git a/Android.bp b/Android.bp
index 2699647..1528bb0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -277,7 +277,6 @@
     apex_available: [
         "//apex_available:platform",
         "com.android.os.statsd",
-        "test_com.android.os.statsd",
     ],
     min_sdk_version: "29",
 }