Improve snapshots cleanup logic

[uri-weisman]

Currently, cloudbeat deletes the snapshots at the end of the cycle. In case cloudbeat panics or receives a new configuration before the cycle has ended it can lead to dangling snapshots in the customer's cloud account.

Describe the solution you'd like

• [ ] Cloudbeat handles snapshot cleanup in cases of panic / new config.
• [ ] Add to the VM documentation that some dangling snapshots may persist in the customer's cloud account by using our integration.

Additional context discussion