fix(practitioner): migrate Practitioner.name.family to unified type

[makelicious]

Issue:

1. At least on versions 1.2 - 1.2.1 Practitioner.name[elem].family used to be string[]
2. At some stage, probably during 2023, value changed to string
3. Mismatch created issues during data indexing.

Solution:
Create migration to map the value to string.

[github-actions]

Oops! Looks like you forgot to update the changelog. When updating CHANGELOG.md, please consider the following:

• Changelog is read by country implementors who might not always be familiar with all technical details of OpenCRVS. Keep language high-level, user friendly and avoid technical references to internals.
• Answer "What's new?", "Why was the change made?" and "Why should I care?" for each change.
• If it's a breaking change, include a migration guide answering "What do I need to do to upgrade?".

[makelicious]

If there is a simpler way of doing it, I will appreciate tips.