requestIdleCallback

This release includes several bug fixes across various Angular packages, including improvements to hydration error handling, form validation, and HTTP request processing. New features include the ability for templates to access private properties and the addition of `containsTree` to the router's public API.

This release includes various bug fixes across multiple Angular packages, including improvements to animations, common utilities, compiler, core functionalities, forms, http client, language server, platform browser, and router. Notably, it replaces `hasOwnProperty` with `Object.hasOwn` for better object property checking.