Feat: add hardfork tests

[kneerose]

List of changes

• Add visibility, validation and proposal creation test for hardfork
• Add draft creation and edit test for hardfork
• Add test to submit a hardfork proposal and its anchor validation

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

[github-actions]

✅ All checks succeeded

[github-actions]

✅ All checks succeeded

[github-actions]

✅ All checks succeeded