feat: add reporter username to vulnerability

[marco-ippolito]

Fixes: https://github.com/nodejs-private/security-release/issues/10 @RafaelGSS do we also want to add name?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.97%. Comparing base (9a8605e) to head (432c90c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #782 +/- ## ======================================= Coverage 82.97% 82.97% ======================================= Files 37 37 Lines 4200 4200 ======================================= Hits 3485 3485 Misses 715 715 ```

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