Adding isAuthoritative property

[AnithaTallam]

Adding a new param isAuthoritative to the Set-SPOSite and Get-SPOSite so tenant admins with co-pilot license can make the site as Authoritative so it signals to Microsoft Search, Copilot(BizChat), and other AI agents that the content is official, trusted, and verified

[learn-build-service-prod]

Learn Build status updates of commit bff801a:

✅ Validation status: passed

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[learn-build-service-prod]

Learn Build status updates of commit 62c4636:

✅ Validation status: passed

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sharepoint/sharepoint-ps/Microsoft.Online.SharePoint.PowerShell/Set-SPOSite.md	✅Succeeded	View (sharepoint-ps)

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[AnithaTallam]

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[learn-build-service-prod]

Learn Build status updates of commit 65b389f:

✅ Validation status: passed

File	Status	Preview URL	Details
sharepoint/sharepoint-ps/Microsoft.Online.SharePoint.PowerShell/Set-SPOSite.md	✅Succeeded	View (sharepoint-ps)

For more details, please refer to the build report.

[samkabue]