feat: new arg to publish command

[dvarasani-crest]

Issue number:

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Added new argument --stage to ucc-gen publish command to enable users to use staging splunkbase to publish the package.

Changes

• No major changes. Just a new argument to existing command

User experience

• No change

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Demo/meeting:

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

[hetangmodi-crest]

Are we planning to expose this for all UCC users, or is this for a specific use case?

[github-actions]

Code Coverage ⚠️

Type	PR	Develop	Change	Status
Line Coverage	94.28%	94.37%	0.08%	🔴 Decreased
Branch Coverage	90.32%	90.50%	0.18%	🔴 Decreased