Adding unified SecOps w Sentinel + XDR publish after USX goes live

[batamig]

Publish only after https://github.com/MicrosoftDocs/defender-docs-pr/pull/1869 goes live.

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Learn Build status updates of commit e26cc73:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/security/index.yml	:white_check_mark:Succeeded

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PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.