Whenever `generateKey` fails updated AttestKeyTests to abort instead of

continuing the execution of the test.

If generateKey fails and execution continues then it leads to issues
while verifying the attest records and causing the crash.

Test: atest VtsAidlKeyMintTargetTest
Bug: 292300030
Change-Id: I66bd650423e9e5bbbfe8411a1455c4ea5846f1ff