wp-disable-deactivation-links.php

<?php

// drop this file in your wp-content/mu-plugins/ folder to hide all Deactivate links in the plugins screen

// removes deactivation links
add_filter( 'plugin_action_links', function ( $actions, $plugin_file ) {
	unset( $actions['deactivate'] );
	return $actions;
}, 10, 2 );

// don't allow plugin bulk actions
add_filter( 'bulk_actions-plugins', function ( $actions ) {
	return array();
} );