Add actions to organization projects list

What does this MR do and why?

Related to #409030 (closed)
Designs: https://gitlab.com/gitlab-org/gitlab/uploads/06f873210db081ff194a6d6445cfced2/Actions.png

The grouptenant scale team is starting to build out an Organization MVC. For more information about what an "Organization" will be see https://docs.gitlab.com/ee/user/organization/

This MR continues to build the Groups and projects page by adding edit and delete actions to the project view.

What is implemented in this MR

• Add actions dropdown with edit and delete actions
• Show confirmation modal when clicking delete action

What will be implemented in future MRs

• Use real data when GraphQL API is completed - GraphQL changes for organization level group da... (#409311 - closed)
• Call API to delete project after confirming in modal
• Groups view - Organization level group dashboard page (#409029 - closed)
• Empty state
• Pagination

Screenshots or screen recordings

Desktop

Closed	Open	Delete confirmation modal

Mobile

Closed	Open	Delete confirmation modal

How to set up and validate locally

1. Open Rails console
   • bin/rails console
2. Enable the feature flag
   • Feature.enable(:ui_for_organizations)
3. Create an organization
   • FactoryBot.create(:organization, name: 'GitLab', path: 'gitlab')
4. Navigate to /-/organizations/gitlab/groups_and_projects?display=projects

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.