fix(cli): reject multiple list tag filters

[AyobamiH]

Summary

Reject multiple distinct --tag filters in the Sandbox CLI before making the API request.

The Sandbox API currently supports filtering by a single tag. While #312 adds type-level protection for SDK consumers, CLI input is runtime data and can still contain multiple tags.

This adds CLI-side validation so users receive an immediate, actionable error instead of an API error.

Changes

• Reject more than one distinct --tag filter in sandbox list
• Preserve the existing single-tag behaviour
• Avoid making an API request when the input is invalid
• Add regression coverage for valid and invalid tag filtering
• Add a patch changeset for the CLI package

Testing

Added command-level tests verifying:

• a single --tag is forwarded to sandboxClient.list()
• multiple distinct --tag values produce an error
• sandboxClient.list() is not called when multiple tags are supplied

Follow-up to the runtime validation concern raised in #312.

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