Add hook in ticket parameter to add and change new variables - #20880

Hi,

Thanks for the contribution.

1. This should be made in a generic way.

For instance, to get additionnal parameters, you can do something like that in the TemplateDocumentation class, to make the plugin being able to define additional parameters for all the supported object types.

$additionnal_parameters = [];
foreach ($PLUGIN_HOOKS[Hooks::SHOW_ITEM_RESP_PARAM] as $plugin => $hook_callable) {
    $plugin_parameters = Plugin::doOneHook($plugin, Hooks::SHOW_ITEM_RESP_PARAM, $parameters_class::getDefaultNodeName());
    if (is_array($plugin_parameters)) {
        array_push($additionnal_parameters, ...$plugin_parameters);
    }
}

2. The naming is not correct. These hooks will be used to add additionnal user templates nodes, so something like get_content_template_parameter and get_content_template_value would be more appropriate.

Hello,
thanks you for your return. Sorry for the delay. I made the change to extend to a generic way.
Please let me know if there are any other changes to be made.

Sorry for the delay.

I rebased your branch to fix conflicts, and added a commit to rename the hook parameters (NodeName -> node_name).

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