Not sure what the problem is, you’re practically there! You can use your code anywhere (as long as it’s after the init hook), not just in template files.
$terms = get_terms( 'MYTAXONOMY' );
$term_slugs = wp_list_pluck( $terms, 'slug' );
wp_list_pluck() is a very cool little function that will pluck a field out of an array of arrays/objects & return it as a single array:
print_r( $term_slugs ); // Array( 'slug_1', 'slug_2', ... )
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