Remove Yoast's 'fill_cache' callback from Event Espresso's wpuser_login step ajax request.

ee_remove_yoast_fill_cache.php

<?php

// Remove Yoast fill_cache from EE's wpuser_login ajax request.
add_action( 'wp_loaded', 'ee_remove_yoast_fill_cache', 10);
function ee_remove_yoast_fill_cache(){
    if( wp_doing_ajax() ) {
        if(
            class_exists('WPSEO_Options') 
            || class_exists('EE_Registry') 
            || EE_Registry::instance()->REQ->get('step', '') === 'wpuser_login'
        ) {
            $Admin_Columns_Cache_Integration = YoastSEO()->classes->get( 'Yoast\WP\SEO\Integrations\Admin\Admin_Columns_Cache_Integration' );
            remove_action( 'admin_init', [ $Admin_Columns_Cache_Integration, 'fill_cache' ], 10 );
        }
    }
}