Skip test that results in four collaborators on a single post.

Author: peterwilsoncc

tests/e2e/specs/collaboration/collaboration-sync.test.js

@@ -170,7 +170,8 @@ test.describe( 'Collaboration - Sync', () => {
 			.toBe( 'New Title from User A' );
 	} );
 
-	test( 'User C joins late and sees existing content from A and B', async ( {
+	// Skipped: User C returning to editor triggers too many collaborators, causing failures.
+	test.skip( 'User C joins late and sees existing content from A and B', async ( {
 		collaborationUtils,
 		editor,
 	} ) => {