Workaround for tradefed's silent failure issue

Record an exception in the ctor and report it later.

Flag: EXEMPT host test change only
Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Test: Manual test with throwing from the constructor
Change-Id: I64e0b8d488b119804027043d180499d485d7b5d5