Create DAST Configuration Page

Feature epic - &5981 (closed)

Proposal

• Add link to dast configuration page.
  • Add enable button
  • Add manage button
  • Control it via feature flag dast_configuration_ui
• Create new controller action, routes and basic HAML view.
  • route security/configuration/dast
  • controller dast_configuration controller
  • update ee/config/routes/project.rb
• Add RSpecs tests for all of the above.