Change request mechanism on Profile

We need to provide a flow for Users to be able to change their Profile's certain fields that need to be approved e.g. permanentAddress.

Also, yearly we should remind them to check their Profile if it has real life values. Status of studies is another issue, see other sub-issue.

As per rules, the User needs to change Profile important data (like name, permanent address) within 15 days of change.

No file or test is named. Start by tracing the existing Profile and user-data flow, then map the approval path for fields such as permanentAddress, the yearly reminder, and the 15-day rule; the studies-status request is tracked separately.

Written by the indexing model from the issue text.