remove-trash-link-wordpress.php

<?php

function custom_remove_post_row_actions( $actions ) {
    // You could check the post type or users here to only do this under certain conditions.
    unset( $actions['trash'] );
    return $actions;
}
add_filter( 'post_row_actions', 'custom_remove_post_row_actions', 10, 1 );