Refactor set_project method in staging controller

find_by! is raising the ActiveRecord::RecordNotFound exception
when no record was found.

Co-authored-by: Dany Marcoux <dmarcoux@suse.com>

src/api/app/controllers/staging/projects_controller.rb

@@ -4,7 +4,6 @@ class Staging::ProjectsController < ApplicationController
   private
 
   def set_project
-    @project = Staging::StagingProject.find_by(name: params[:project])
-    raise ActiveRecord::RecordNotFound unless @project
+    @project = Staging::StagingProject.find_by!(name: params[:project])
   end
 end