[automerge] Disable pre-submit host unit-testing for `libnativebridge-tests`. 2p: 7747ac6d13 2p: 582bbcf317 am: a5a7138dd7 am: 927a38df22

Original change: https://googleplex-android-review.googlesource.com/c/platform/art/+/19606714

Change-Id: I7b8d6488e5b34e63e4c92f82367eec0055758078
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>