[automerge] Disable pre-submit host unit-testing for `libnativebridge-tests`. 2p: 7747ac6d13

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

Bug: 242237732
Bug: 241124414
Change-Id: I19dc782952893d6ac65b3c95a76ff95fd461d845
Merged-In: Id10e844adf9f2ef3ca24082f0fc501b5e911481b