Address vue/no-unused-properties violations in app/assets/javascripts/sidebar/ (part 3)

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What does this MR do and why?

Fixes eslint rule in the following files:

• app/assets/javascripts/sidebar/components/reviewers/reviewer_avatar_link.vue
• app/assets/javascripts/sidebar/components/reviewers/sidebar_reviewers.vue
• app/assets/javascripts/sidebar/components/reviewers/uncollapsed_reviewer_list.vue

References

Issue: #525766

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