[RESTRICT AUTOMERGE]: Add STS annotations to EphemeralTest am: 4b71bfd4d1 am: 815aed608a am: ae4742027e

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/12787528

Change-Id: I854556c9b114e393d848ffb11a3d19b246078bba