Support lookup by channel name or ID for channel delete command

[sgalsaleh]

Summary

Updates replicated channel delete (and its alias rm) to accept either a channel name or a channel ID, matching the behavior of other channel commands such as inspect and release demote.

Problem

Previously, replicated channel delete <name> failed with archive app channel: Not found. because the command passed the raw argument directly to the archive API as an ID, with no name resolution.

Solution

Uses the existing GetChannelByName helper (already used by channel inspect) to resolve the input to a channel before calling ArchiveChannel. This provides:

• Lookup by exact channel ID (fast path)
• Fallback to name matching against the app's channel list
• Built-in ambiguous-match and not-found error handling

Changes

• cli/cmd/channel_rm.go:
  • Updated usage string: rm CHANNEL_ID_OR_NAME
  • Updated missing-arg error: channel name or ID is required
  • Added GetChannelByName resolution before ArchiveChannel