A special API endpoint is used to pass custom variables to admin UI for various use cases
Defined by the "ENV_URL" environment variable (defaulting to /GetAdminEnvironment), admin UI pulls global configuration parameters from backend services, which can be utilized in two main areas:
Setting the global home page, by returning a landingTemplatePath field, including API endpoint (e.g. request/cms_rpc/GlobalLandingPage) to be called for retrieving handlebars template to populate the page.
Returning values, which are accessible by UI elements in patterns as _meta.environment, such as customizing widget properties based on a backend calculation or configuration.
