Address vue/no-unused-properties violations in in app/assets/javascripts/boards/

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What does this MR do and why?

Address vue/no-unused-properties violations

• In app/assets/javascripts/boards/components/board_add_new_column_form.vue
• In app/assets/javascripts/boards/components/board_card_inner.vue
• In app/assets/javascripts/boards/components/board_card_move_to_position.vue
• In app/assets/javascripts/boards/components/board_content.vue
• In app/assets/javascripts/boards/components/board_filtered_search.vue
• In app/assets/javascripts/boards/components/board_list_header.vue
• In app/assets/javascripts/boards/components/board_settings_sidebar.vue
• In app/assets/javascripts/boards/components/boards_selector.vue
• In app/assets/javascripts/boards/components/issue_due_date.vue
• In app/assets/javascripts/boards/components/project_select.vue

References

Fixes #525714 (closed)

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