User migration (MVP)

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Is your feature request related to a problem? Please describe.
Bump functionality to MVP level for initial release - import/export user data feature to enable users or admins to migrate a user and their data from one server/instance to another.

Adding Calendar and Contacts to the already given scope (files - #30397)

Describe the solution you'd like
A way to also export and import a user's calendar and contacts data - as the user themself via webUI as well as being an admin via occ

• Extend export UI - Add information about what will be exported (files, notes, calendar, contacts)
• https://github.com/nextcloud/server/pull/30963
• Migrate contacts - Add export and import capability for user's contacts

Review the existing user-data migration work referenced by pull request #30963, then trace the webUI and occ entry points for user export and import. Confirm how the current export reports included data, and use the checklist as the completion criteria: calendar and contacts migration plus export-information coverage.