Delete old browser data on migration

This policy determines whether user browsing data from Microsoft Edge Legacy will be deleted after migrating to the Microsoft Edge version 81 or later. If you set this policy to "Enabled", all browsing data from Microsoft Edge Legacy after migrating to the Microsoft Edge version 81 or later is deleted. This policy must be set before migrating to the Microsoft Edge version 81 or later to have any effect on existing browsing data. If you set this policy to "Disabled", or the policy isn't configured, user browsing data isn't deleted after migrating to the Microsoft Edge version 83 or later.