Update function name to not be opinionated

Co-authored-by: Gabriel Caires <[email protected]>

client/landing/stepper/declarative-flow/internals/steps-repository/site-migration-how-to-migrate/use-pending-migration-status.ts

@@ -27,7 +27,7 @@ const usePendingMigrationStatus = ( { onSubmit }: PendingMigrationStatusProps )
 		}
 	}, [ siteId, updateMigrationStatus ] );
 
-	const onOptionClick = ( how: string ) => {
+	const setPendingMigration = ( how: string ) => {
 		const destination = canInstallPlugins ? 'migrate' : 'upgrade';
 		if ( siteId ) {
 			const parsedHow = how === HOW_TO_MIGRATE_OPTIONS.DO_IT_MYSELF ? 'diy' : how;