Sync OWASP Board of Directors Members Data

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**Describe the solution you'd like**

We need to implement functionality to sync OWASP Board of Directors (BOD) members into the Nest system for a given election year. The source of truth for candidates is the https://github.com/OWASP/www-board/blob/master/_data/board-history.yml

This task involves:
- Parsing YAML files in the source repository to extract candidate names.
- Creating EntityMember instances for each candidate:
- role must be set to EntityMember.Role.MEMBER.
- The EntityMember should be linked to the corresponding BoardOfDirectors instance for the correct year.

- Preparing for further manual verification:
- The created candidates will be fuzzy matched against existing github.User instances to link them automatically where possible.
- The final verification and confirmation will be done manually.

**Are you going to work on implementing this?**

- [ ] Yes
- [x] No

**Additional context**
- [BoD model](https://github.com/OWASP/Nest/blob/main/backend/apps/owasp/models/board_of_directors.py)
- [EntityMember model](https://github.com/OWASP/Nest/blob/main/backend/apps/owasp/models/entity_member.py)
- [Event data sync example](https://github.com/OWASP/Nest/blob/main/backend/apps/owasp/management/commands/owasp_update_events.py)
- [Post data sync example](https://github.com/OWASP/Nest/blob/main/backend/apps/owasp/management/commands/owasp_sync_posts.py)
- [Fuzzy matching example](https://github.com/OWASP/Nest/blob/main/backend/apps/owasp/management/commands/owasp_update_leaders.py#L106)