feat: add delete freight command

[ChihebBENCHEIKH1]

Summary

Add a CLI command to delete Freight resources by name or alias.
The API and UI already support this operation but the CLI was missing it.

• Supports deletion by name or alias (uses the existing FreightNameOrAlias API parameter)
• Supports deleting multiple Freight resources in a single invocation
• Follows the same patterns as the existing delete stage and delete warehouse commands

Usage

# Delete by name
kargo delete freight --project=my-project abc1234

# Delete by alias
kargo delete freight --project=my-project wonky-wombat

# Delete multiple
kargo delete freight --project=my-project abc1234 def5678
Closes #6162

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[krancour]

Thank you @ChihebBENCHEIKH1! I will look at this first thing on Monday.