DomainTestSupport and DomainLifecycleUtil should be AutoCloseable

Let DomainTestSupport and DomainLifecycleUtil be used in try-with-resources.

Once closed the objects should not be usable; i.e. this differs from stop(), where start() can be called again.

DomainTestSupport.stop() can closes the DomainLifecycleUtil objects it controls though, preventing their subsequent use. This will protect against the WFCORE-4384 problem.