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

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What does this MR do and why?

Fixes vue/no-unused-properties ESLint rule.

Note: Only ee/app/assets/javascripts/tracing/details/tracing_details.vue was changed as the other file (ee/app/assets/javascripts/tracing/details/related_issues/related_issues_provider.vue) passed the violation rule

References

Issue: #525823 (closed)

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