Problem

Notice rendering logic is currently duplicated across multiple editor interfaces (@wordpress/edit-post, @wordpress/edit-site, @wordpress/edit-widgets, @wordpress/boot), with components tightly coupled to the @wordpress/editor package. This creates several issues:

1. Code duplication: Each editor interface reimplements similar notice rendering logic
2. Maintenance overhead: Changes to notice rendering require updates in multiple places
3. Tight coupling: Notice rendering components are tied to editor-specific code, making them difficult to reuse
4. Inconsistency: Different editor interfaces may have slightly different implementations, leading to inconsistent behavior

Proposed Solution

Extract notice rendering components from @wordpress/editor into the @wordpress/notices package, making them reusable across all editor interfaces and other contexts.