Launchpad: Update tasks to redirect into site-editor edit mode (#72339)

* Pass site-editor canvas mode query param to iframe

* Update launchpad site-editor navigation

* Default to site editor "edit-mode"

* Revert site editor route changes

client/gutenberg/editor/calypsoify-iframe.tsx

@@ -811,6 +811,7 @@ const mapStateToProps = (
 		...pressThisData,
 		answer_prompt: getQueryArg( window.location.href, 'answer_prompt' ),
 		completedFlow,
+		canvas: 'edit', // Load side editor in edit mode instead of displaying sidebar by default (Gutenberg v15.0.0)
 	} );
 
 	// needed for loading the editor in SU sessions