Prevent certain cron events from existing

ignore-cron-events.php

<?php

function get_cron_events_to_ignore() {
	return [
		'a8c_cron_control_force_publish_missed_schedules',
		'a8c_cron_control_confirm_scheduled_posts',
	];
}

// If an ignorable cron event runs, let's unschedule it so it runs no more.
add_filter( 'init', function() {
	foreach ( get_cron_events_to_ignore() as $event_hook ) {
		add_action( $event_hook, function() use ( $event_hook ) {
			wp_unschedule_hook( $event_hook );
		} );
	}

	return $scheduled;
}, 1 );

// Prevent ignorable cron events from being registered again.
add_filter( 'pre_schedule_event', function( $scheduled, $event ) {
	if ( null !== $scheduled ) {
		return $scheduled;
	}

	if ( in_array( $event->hook, get_cron_events_to_ignore(), true ) ) {
		$scheduled = false;
	}

	return $scheduled;
}, 1, 2 );