Add an eviction / restoration integration test

[tamirms]

We have integration tests which exercise expiration and restoration of contract asset balances. However, these integration tests do not exercise eviction of contract data ledger entries because eviction is only implemented in protocol 23.

Once we have a protocol 23 enabled stellar rpc docker image we should add a horizon integration test which evicts a contract asset balance and asserts the /assets response works as expected. The test should also attempt to restore the evicted contract asset balance and assert the /assets response now includes the restored contract asset balance.