Collaboration: Remove deprecated wp-sync/v1 route test

The backward-compatible wp-sync/v1 route alias was removed in
24f4fdc, making this test invalid.

Author: josephfusco

tests/phpunit/tests/rest-api/rest-collaboration-server.php

@@ -1754,53 +1754,6 @@ public function test_collaboration_awareness_cache_reflects_latest_write(): void
 	 * Query count tests.
 	 */
 
-	/*
-	 * Deprecated route tests.
-	 */
-
-	/**
-	 * Verifies the deprecated wp-sync/v1 route alias works identically to
-	 * the canonical wp-collaboration/v1 namespace.
-	 *
-	 * @ticket 64696
-	 */
-	public function test_collaboration_deprecated_sync_route() {
-		wp_set_current_user( self::$editor_id );
-
-		$room   = $this->get_post_room();
-		$update = array(
-			'type' => 'update',
-			'data' => 'c3luYyByb3V0ZQ==',
-		);
-
-		// Send an update via the deprecated namespace.
-		$response = $this->dispatch_collaboration(
-			array(
-				$this->build_room( $room, '1', 0, array( 'user' => 'client1' ), array( $update ) ),
-			),
-			'wp-sync/v1'
-		);
-
-		$this->assertSame( 200, $response->get_status(), 'Deprecated wp-sync/v1 route should return 200.' );
-
-		$data = $response->get_data();
-		$this->assertArrayHasKey( 'rooms', $data, 'Response should contain rooms key.' );
-		$this->assertSame( $room, $data['rooms'][0]['room'], 'Room identifier should match.' );
-
-		// Verify the update is retrievable via the canonical namespace.
-		$response2 = $this->dispatch_collaboration(
-			array(
-				$this->build_room( $room, '2', 0 ),
-			)
-		);
-
-		$updates = $response2->get_data()['rooms'][0]['updates'];
-		$this->assertNotEmpty( $updates, 'Update sent via deprecated route should be retrievable via canonical route.' );
-
-		$update_data = wp_list_pluck( $updates, 'data' );
-		$this->assertContains( 'c3luYyByb3V0ZQ==', $update_data );
-	}
-
 	/*
 	 * Payload limit and permission hardening tests.
 	 */