Change out path to android_target-opt in bazel integration tests

ag/c/platform/build/bazel/+/20584767/15/common.bazelrc#116 defaulted our build to opt compilation mode which affects bazel's output path. This change fixes the tests to reflect that.

Test: ./tests/apex_comparison_tests.sh
Test: ./tests/bp2build_bazel_test.sh
Bug: 253540178
Change-Id: Idc42a2c3173800db0d6155ef3d74e33c15d220d0
Merged-In: Idc42a2c3173800db0d6155ef3d74e33c15d220d0