[FEAT cloudctl] - Add `--output` flag (json/yaml) to all commands

[onuryilmaz]

[FEAT cloudctl] - Add --output flag (json/yaml) to all commands

Labels

• feature
• AI-ready
• automation

Priority

(Medium) I'm annoyed but I'll live

User Story

As an AI agent or automation script, I can get the output of any command in JSON format, so that I can easily parse and act upon the information.

Description

Currently, many commands (like cluster-version) print plain text. Adding a global or per-command --output flag (supporting json, yaml, table) makes the CLI a first-class citizen for automation and AI tool-calling.

Acceptance Criteria

• Implement --output (or -o) flag for cluster-version and sync.
• Support json, yaml, and default text.
• Ensure sync summary is available in JSON.
• Use omitzero in JSON structs as per modern Go guidelines.

Reference Issues

None