Resolve StrongParams rubocop TODOS for Clusters

• Follow the recommended refactor options in Resolve StrongParams rubocop TODOs (&14255) for these files:
  • 'app/controllers/clusters/agents/dashboard_controller.rb'
  • 'app/controllers/clusters/base_controller.rb'
  • 'app/controllers/clusters/clusters_controller.rb'
• Remove the files from .rubocop_todo/rails/strong_params.yml