[Personalize] Remove unused component experiences from layout

[yavorsk]

• This PR follows the Contribution Guide
• Changelog updated

Description / Motivation

This PR makes sure that any unused personalized variants are deleted before sending layout data to the client, thus are completely hidden from the customer.

Testing Details

• Unit Test Added
• Manual Test/Other (Please elaborate) - Personalize a component in xmcloud and make sure that, when you run your app in production or in vercel, in the layout data json (can be found in the resulting html of the page) does not contain any personalize experiences of the component and personalization works properly;

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)