Create shared haml files for Usage Quotas pages

What does this MR do and why?

This MR improves and DRY up the haml files for Usage Quotas Pages. Changes involve:

1. Create a shared usage_quotas view in app/views/shared/usage_quotas/: Solves #458218
   1. Use this shared view in the pages specific views: Group, Project, Profile
   2. Page specific content using yield and content_for. Three keys: usage_quotas_alerts, :usage_quotas_subtitle, :usage_quotas_tabs
2. Deduplicate Group usage quotas
   1. Rely only on app/views/groups/usage_quotas/index.html.haml
   2. Delete ee/app/views/groups/usage_quotas/index.html.haml
   3. All the EE specific content is moved into partials under ee/app/views/shared/usage_quotas/
3. Add License check for pipelines tab. Solves: #455101
   1. Add :admin_ci_minutes to ee/app/policies/ee/namespaces/user_namespace_policy.rb

MR acceptance checklist

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Screenshots or screen recordings

No UI changes

Before	After
all_usage_quotas_pages_master	all_usage_quotas_pages_150164

How to set up and validate locally

Visit Usage Quotas pages and compare the screenshots:

1. Group Usage Quotas: https://gitlab.com/groups/<group-id>/-/usage_quotas
2. Project Usage Quotas: https://gitlab.com/<group-id>/<project-id>/-/usage_quotas
3. Profile/User Namespace Usage Quotas: https://gitlab.com/-/profile/usage_quotas