Feature: Add design and option to indicate you're highlighting someone else's work

[BekahHW]

Type of feature

🍕 Feature

Current behavior

Right now, there's only one style of highlight. However, sometimes maintainers or teammates want to highlight the work of other contributors.

Suggested solution

1. First, we'd need to ask the user whose work they're highlighting (their own or someone else's).
2. Once the highlight is submitted, there should be a visual indication and label that the user is highlighting someone else's work.

Additional context

No response

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