Update Agent Builder sharing and management guidance

[Suri-momo]

Summary

• document multi-owner roles and role management
• add org-wide sharing and admin governance guidance
• add About information and org catalog submission guidance
• update article ownership and revision metadata

Validation

• targeted markdownlint passed
• targeted cspell passed
• unused image scan passed

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[Suri-momo]

we need this section added to new version as well. add it back