I think you need to do the add_action( 'wp_head', 'add_meta_tags' , 10 ); in your functions.php instead of the template to get the function called. And it adds it then everywhere where you have wp_head(). So if you want to only call it content-share.php you need some conditioning logic like
if (is_page_template('page-templates/content-share.php')) {
add_action( 'wp_head', 'add_meta_tags' , 10 );
}
Of course change the page-templates folder to be what ever the folder is where you have the template in your theme folder.
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