feat: show optional authors in gtk about panel

[codebytere]

Description of Change

Refs #2 in #18918.

This PR adds the ability to set a list of authors in the native Linux about panel.

I chose not to add this to the existing credits options owing to incompatible parameter types. We could potentially do it, but i felt that the added argument sanitization outweighed the benefit of being able to use a single argument across both platforms for this.

cc @ckerr @sindresorhus

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• relevant documentation is changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Added the ability to set authors in the Linux implementation of the About panel.

The changes I requested have been merged; but since I've also pushed code, I shouldn't be the one to approve

[release-clerk]

Release Notes Persisted

Added the ability to set authors in the Linux implementation of the About panel.