Deletes a key from the project. Requires Manage keys admin right.

Project Type Compatibility:

• ✅ Software projects (localization_files) - Only project type that supports branching and individual key operations
• ❌ Documents projects (paged_documents) - Branching not supported
• ❌ Marketing projects (content_integration, marketing, marketing_integrations) - Branching not supported

Requires delete_keys OAuth access scope.