Address vue/no-unused-properties violations

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What does this MR do and why?

Address vue/no-unused-properties violations

• In app/assets/javascripts/projects/commit/components/form_modal.vue
• In app/assets/javascripts/projects/commit/components/projects_dropdown.vue
• In app/assets/javascripts/projects/filtered_search_and_sort/components/filtered_search_and_sort.vue
• In app/assets/javascripts/projects/new_v2/components/project_destination_select.vue

References

Fixes #525756 (closed)

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