Introduce vue3_migrate_work_items to migrate Work items applications to Vue 3

Natalia Tepluhinarequested to merge
ntepluhina-work-items-vue3 into master

What does this MR do and why?

Introduce vue3_migrate_work_items to migrate Work items applications to Vue 3

This change defines the vue3_migrate_work_items feature flag to allow Work items app to run using Vue 3 in compatibility mode.

The behavior of the applications should be the same.

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