cli/delete: improve platform deletion help text and output

[natemccurdy]

• Clarify help text to indicate one or more platform IDs as arguments.
• Show platform name and ID in delete platform output for clarity.

Help Text

Before this change:

$ holos delete platform --help                                          
platform

Usage:
  holos delete platform [flags]

Flags:
  -h, --help      help for platform
  -v, --version   version for platform

Global Flags:
      --log-drop strings    log attributes to drop (example "user-agent,version")
      --log-format string   log format (text|json) (default "text")
      --log-level string    log level (debug|info|warn|error) (default "info")

After this change:

$ holos delete platform --help            
Delete one or more platforms by ID

Usage:
  holos delete platform [flags] PLATFORM_ID [PLATFORM_ID ...]

Flags:
  -h, --help      help for platform
  -v, --version   version for platform

Global Flags:
      --log-drop strings    log attributes to drop (example "user-agent,version")
      --log-format string   log format (text|json) (default "text")
      --log-level string    log level (debug|info|warn|error) (default "info")

Output

Before this change:

$ holos delete platform 0190d1dd-2201-7277-8bd8-4025bf561af3 0190d1dd-1e78-7d81-81d5-5edf01afa712 0190d1dd-192a-7d81-ae55-5bd8698522c3
deleted platform rand-11805
deleted platform rand-2217
deleted platform rand-963

After this change:

$ holos delete platform 0190d1dd-2201-7277-8bd8-4025bf561af3 0190d1dd-1e78-7d81-81d5-5edf01afa712 0190d1dd-192a-7d81-ae55-5bd8698522c3
deleted platform rand-11805 (0190d1dd-2201-7277-8bd8-4025bf561af3)
deleted platform rand-2217 (0190d1dd-1e78-7d81-81d5-5edf01afa712)
deleted platform rand-963 (0190d1dd-192a-7d81-ae55-5bd8698522c3)

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