Add auditTrace mixin to experience page

CMS-13199 Every CONTENT change to the unpublished variant of an Experience Page should result in a new version

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• Closed

CMS-13379 When creating a new Experience Document Type, support choosing the XPage type of page

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• Closed

CMS-13471 The hst:page below an XPage document should be skipped between draft and unpublished variant

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• Closed

CMS-13379 When creating a new Experience Document Type, support choosing the XPage type of page

• 
• Closed