Merge changes from topic "am-252e5a42622040ef9e7750d98f260daf" into android15-tests-dev

* changes:
  Merge changes from topic "cherrypicker-selfservice-L57800030041749000:N71700030397883874" into android14-tests-dev am: d1be135e99
  Skip ConcurrentCloseTests on network unreachability am: 103227d22a
  Attempt to fix ConcurrentCloseTest flakiness and speed-up the test am: f40b75bc02
  Make ConcurrentCloseTest#test_write more reliable am: ad24d861fb