feat: reintegrate username functionality

[alexbarnsley]

Summary

https://app.clickup.com/t/86dvdmpme

Mostly reverting username removals from #1000

TODO:

• Add tests
• PHPStan
• Review the below files for username first, known first, or enforce one of the two - I set them up with the same functionality as previously

---

• resources/scripts/vote-report.sh - add username?
• resources/views/app/wallet.blade.php - prioritize username or known name?
• resources/views/components/general/identity-iconless.blade.php - prioritize username or known name?
• resources/views/components/stats/insights/desktop/validator-row.blade.php - prioritize username or known name?
• resources/views/components/stats/insights/mobile/validator-row.blade.php - prioritize username or known name?

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my UI changes in light AND dark mode
• I checked my (code) changes for obvious issues, debug statements and commented code
• I opened a corresponding card on Clickup for any remaining TODOs in my code
• I added a short description on how to test this PR (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged