Filter out core annotations from active formats in format-boundaries.js

- Updated the logic in the format-boundaries event listener to exclude formats of type 'core/annotation' from both `formatsBefore` and `formatsAfter`. This ensures that editor-only formats do not interfere with user selections during formatting operations.

These changes enhance the accuracy of active format management in the editor.

Refs #71698

Author: maxschmeling

packages/rich-text/src/component/event-listeners/format-boundaries.js

@@ -62,8 +62,12 @@ export default ( props ) => ( element ) => {
 			return;
 		}
 
-		const formatsBefore = formats[ start - 1 ] || EMPTY_ACTIVE_FORMATS;
-		const formatsAfter = formats[ start ] || EMPTY_ACTIVE_FORMATS;
+		const formatsBefore = (
+			formats[ start - 1 ] || EMPTY_ACTIVE_FORMATS
+		).filter( ( format ) => format.type !== 'core/annotation' );
+		const formatsAfter = (
+			formats[ start ] || EMPTY_ACTIVE_FORMATS
+		).filter( ( format ) => format.type !== 'core/annotation' );
 		const destination = isReverse ? formatsBefore : formatsAfter;
 		const isIncreasing = currentActiveFormats.every(
 			( format, index ) => format === destination[ index ]