Handle early exit in DBErrorHandlingFSTests #12655
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Summary: To avoid use-after-free on custom env on ASSERT_WHATEVER failure.
This is motivated by a rare crash seen in DBErrorHandlingFSTest.WALWriteError (VersionSet::GetObsoleteFiles in a SstFileManagerImpl::ClearError thread) and wanting to rule out this being related to that.
Test Plan: manually seeing ASSERT_WHATEVER failures, especially under ASAN