[Draft] Add container type registration audit events to SharePoint Embedded docs

[gnjoseph]

Category

• Content fix
• New article

Related issues

• depends on Add SharePoint Embedded audit log events article for container type activities #10772

What's in this Pull Request?

Adds container type registration audit events section to the SharePoint Embedded audit log events article. These events are not yet GA — this PR should remain as a draft until the registration events are generally available.

• Updated article: docs/embedded/compliance/audit-events.md — adds 3 container type registration operations (ContainerTypeRegistrationCreated, ContainerTypeRegistrationDeleted, ContainerTypeRegistrationUpdated)
• Updated search section with both activity categories
• Updated cross-reference in security-and-compliance.md to mention registration events

Related documentation PRs

• Purview-pr PR #7280 — Container Type Registration activities section
• office-365-management-api PR #548 — SharePointAuditOperation enum additions
• Auditing PR #5033059 — AuditOperationsGateConfig.csv + SharePointBaseSchema.xml onboarding
• M365SCC-Client PR #5033060 — Purview portal UI

[learn-build-service-prod]

Learn Build status updates of commit 7ee766d:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/embedded/compliance/audit-events.md	✅Succeeded	View
docs/embedded/compliance/security-and-compliance.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

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[pemtaira-msft]

This file has a lot of whitespace changes but only lines 44-45 semantically changed