Your work projects Vue - add new project and explore projects buttons

Proposal

Currently we are missing the New project and Explore projects buttons. Because there are some permission checks for these buttons I think we should move the page header back to HAML.

Implementation guide

1. In app/views/dashboard/projects/index.html.haml change to:

- if Feature.enabled?(:your_work_projects_vue, current_user)
  - if current_user.authorized_projects.present?
    = render 'dashboard/projects_head'
    #js-your-work-projects-app{ data: { app_data: dashboard_projects_app_data } }
  - else
    = render "zero_authorized_projects"
- else
  - if show_projects?(@projects, params)
    = render 'dashboard/projects_head'
    = render 'projects'
  - else
    = render "zero_authorized_projects"

2. Remove page title from app/assets/javascripts/projects/your_work/components/app.vue