Add transfer confirmation checkbox to the transfer modal

What does this MR do and why?

Create the base transfer modal component that. This will be used to create specialized components for groups and projects

First step for Create shared transfer modal for groups and pro... (#592382 - closed)

References

• Next step: Create group transfer modal component (!228831 - merged)
• Epic: Add transfer to quick actions (gitlab-org#20249)
• Related to #592382 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. Run yarn storybook:start
2. Go to http://localhost:6006/?path=/docs/groups-projects-transfer-modal--docs

MR acceptance checklist

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