Move linked pipeline view from "Free" to "Core"

Summary

gitlab says on https://about.gitlab.com/install/ce-or-ee/

Functionally, it [FOSS] will have the same features as the Free tier in the Enterprise Edition.

In 14.2 the linked-pipelines view feature was added to the Free tier.

But core shows only a simple graph without the linked pipelines

What is the current bug behavior?

• self hosted EE instances with "Free" tier license show linked pipelines
• self hosted FOSS instances show only a simple pipeline graph

What is the expected correct behavior?

• both instances show either the linked pipelines, or none

Relevant logs and/or screenshots

Possible fixes

Move

• ee/app/assets/javascripts/vue_shared/accessors/linked_pipelines_accessors.js
• ee/app/assets/javascripts/vue_shared/components/linked_pipelines_mini_list.vue

into core and adjust some imports.