dev-plugins.php

<?php
/**
 * Plugin Name: Dev Plugins
 */
add_action( 'muplugins_loaded', function() {

	// Plugins to activate automatically.
	$auto_activate = [
		'debug-bar/debug-bar.php',
		'debug-bar-extender/debug-bar-extender.php',
		'debug-bar-console/debug-bar-console.php',
		'mail-test/mail-test.php',
		'rewrite-rules-inspector/rewrite-rules-inspector.php',
		'abkjfdkkj/abkjfdkkj.php',
	];

	// Remove entries that don't exist to avoid activation warnings.
	foreach ( $auto_activate as $k => $slug ) {
		if ( ! file_exists( WP_PLUGIN_DIR . "/$slug" ) ) {
			unset( $auto_activate[ $k ] );
		}
	}

	// Force activation.
	add_filter( 'option_active_plugins', function ( $option ) use ( $auto_activate ) {
		return array_merge( $option, $auto_activate );
	});

	// Remove from UI.
	add_filter( 'all_plugins', function ( $all_plugins ) use ( $auto_activate ) {
		foreach ( $auto_activate as $k ) {
			if ( isset( $all_plugins[ $k ] ) ) {
				unset( $all_plugins[ $k ] );
			}
		}
		return $all_plugins;
	});

});