[ORC][examples] Temporarily remove LLJITWithChildProcess until ORC TPC lands

This solves a phase ordering problem: OrcV2 remote process support depends on OrcV2 removable code, OrcV2 removable code depends on OrcV1 removal, OrcV1 removal depends on LLJITWithChildProcess migration, and LLJITWithChildProcess migration depends on OrcV2 TargetProcessControl support.