Move VM snapshotting logic to orchestrator

[leokondrashov]

Describe the enhancement
The current split of responsibilities between orchestrator and coordinator is confusing: the coordinator enforces snapshotting modes (e.g., in coordinator's startVMWithEnvironment), while the configuration is stored in the orchestrator (e.g., snapshotEnabled, snapshotMode).

The proposed structure should move snapshot management to the orchestrator level, leaving the coordinator with high-level instance management operations. In contrast, the orchestrator would be responsible for runtime and snapshot management that keep the instance running.