Replace underscore/lodash in ee/vue_shared

What does this MR do?

This replaces all occurrences of underscore for lodash in ee/app/assets/javascripts/vue_shared

closes: #210267 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides