This change enables floaty delete to accept request-ids (UUID format)
in addition to hostnames. When a request-id is detected, floaty will:
1. Cancel pending ondemand requests by marking status as 'deleted'
2. Move any already-provisioned VMs to the termination queue
Implementation:
- Modified Pooler.delete to detect UUID format and use ondemandvm endpoint
- Updated command syntax and examples to document request-id support
- Added comprehensive tests for request-id deletion
- Fixed Ruby 3.1+ compatibility by adding abbrev and base64 gems
Fixes issue where users had no way to cancel ondemand requests or
bulk-delete VMs from a completed request.
