Sign APEXes only when the package name starts with com.google.android and com.google.mainline. Bug: 243748589 Test: b build //vendor/google/build:com.google.android.adbd_aab --config=android Test: b test //build/bazel/rules/apex:apex_aab_tests Change-Id: I53cc1d84b1f84eb61fbd3c340c95440de98b9dde