Display back to step 1 button for policy editors

Savas Vedovarequested to merge
356890-add-back-to-step-1-button into master

The insert mode now displays a back to step 1 button. The edit mode displays a cancel button which brings the user back to the policies page instead.

Screenshots

Note the slight distance between buttons. It is to satisfy the design: groups/gitlab-org/-/uploads/96e5ae6cbbecd12a42b19733ea975255/step2-edit-policy.png

Edit mode before Edit mode after
image image
Insert mode before Insert mode after
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Changelog: changed EE: true

Related to #356890 (closed)

Edited by Savas Vedova

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