feat(SPV-760): handle insertion of genesis block for chosen chain net during db migration

[kuba-4chain]

Pull Request Checklist

• [x] 📖 I created my PR using provided : CODE_STANDARDS
• [x] 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• [x] 🏠 I tested my changes locally.
• [ ] ✅ I have provided tests for my changes.
• [x] 📝 I have used conventional commits.
• [ ] 📗 I have updated any related documentation.
• [x] 💾 PR was issued based on the Github or Jira issue.

[github-actions[bot]]

Manual Tests

:green_heart: Manual testing by @chris-4chain resulted in success.