Organization controls for enabling Copilot code reviews in projects

Organization administrators should be able to control which projects can enable Copilot Code Review.

A new organization-level setting should determine whether project administrators can enable or disable Copilot Code Review for their own projects. When enabled, project administrators can manage the setting independently. When disabled, only Project Collection Administrators can enable or disable Copilot Code Review for individual projects.

This control gives organizations greater control over where Copilot Code Review is used, while allowing them to delegate management to project administrators when appropriate.