[mesheryctl] Remove onboard command from mesheryctl pattern commands

[singh1203]

See mesheryctl Command Tracker for current status of commands.

Current Behavior

The 'onboard' command is redundant with the 'import' and 'apply' commands.
Users can already achieve the same outcome by using import to import the pattern and apply to deploy it.

Desired Behavior

Removing onboard will simplify the mesheryctl pattern command set.

Screenshots/Logs

Environment

• Host OS: Mac Linux Windows
• Meshery Server Version: stable-v
• Meshery Client Version: stable-v
• Platform: Docker Kubernetes

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Contributor Guides and Handbook

• 📚 mesheryctl Contributing Guide
• 📺 Beginner's guide to contributing to Meshery and mesheryctl
• ⌨️ mesheryctl Command Tracker
• ⌨️ Meshery CLI Commands and Documentation
• 🙋🏾🙋🏼 Questions: Discussion Forum and Community Slack

[github-actions]

This issue has been labeled with 'component/mesheryctl'. Note that after making changes you need to update it in the mesheryctl command tracker spreadsheet.

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[singh1203]

@Yashsharma1911 please assign.

[leecalcote]

Thanks, @singh1203 👍