docs(customization): document AppX removal

[mchave3]

Summary

• Documents provisioned AppX removal on the Customization page.
• Updates Expert Mode and Deployment Flow to include AppX removal handoff behavior.
• Documents pre-OOBE AppX removal staging and telemetry properties.

Reason

The new Customization AppX removal setting changes deployment behavior and telemetry, so operator and reference docs need to describe it.

Main changes

• Added AppX removal controls, profile behavior, and runtime impact to Customization docs.
• Updated Expert Mode deploy configuration coverage.
• Updated Post-WinPE handoff and Deployment Flow docs for pre-OOBE customization staging.
• Added AppX removal telemetry fields and excluded package-name data.

Testing

• npm run typecheck
• npm run build

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