Introduce Cloud Seed AWS Controller

What does this MR do and why?

Introduces a ConfigurationController for Cloud Seed :: AWS

• BaseController verifies if user can access AWS configuration
  • Policy rule admin_project_aws, only maintainers and owners have access
• BaseController verifies if feature flag cloudseed_aws is enabled
• Placeholder index route in ConfigurationController
• Placeholder template
• Routes definition
  • aws/ redirects to configuration
  • aws/configuration points to ConfigurationController#index
• Updates Infrastructure::AWS menu item to point to valid route
• Specs to verify only authorized members can access route
• Specs to verify feature flag enabled

Screenshots or screen recordings

How to set up and validate locally

1. Enable the cloudseed_aws feature flag
2. Navigate to a project where you are maintainer or owner
3. Under infrastructure the AWS menu item should be visible
4. It should point to aws/ that redirects to aws/configuration

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.