[regression] missing menu active trail in Drupal 9.5.9

Problem/Motivation

Since #3277784: copyRawVariables should support default route parameters menu active trail information is missing from menu items under certain circumstances. In my case I've got a view with a path and menu entry and the rendered menu item no longer sets in_active_trail to TRUE when accessing the view on a page with the menu.

This issue is broken out from a different regression: #3358402: [regression] route defaults are now automatically route parameters. There a few relevant comments there:

Comment from @znerol:

I think that $this->routeMatech->getRawParameters()->all() returns a different set of key-value pairs which in turn leads to an empty result from $this->menuLinkManager->loadLinksByroute() in MenuActiveTrail::getActiveLink():

  public function getActiveLink($menu_name = NULL) {
    [...]
      $route_parameters = $this->routeMatch->getRawParameters()->all();

      // Load links matching this route.
      $links = $this->menuLinkManager->loadLinksByRoute($route_name, $route_parameters, $menu_name);
      // Select the first matching link.
      if ($links) {
        $found = reset($links);
      }
    [...]
  }

Comment from @lisotton:

I have some routes that share the same Controller and Action, but in the route declaration it declares default parameters. For example I have the route mymodule.news_list (/news) which have the controller ListPageController::entryPoint with a default parameter called type with value news-list. Then I have another route called mymodule.articles_list (/articles) which shares the same controller, but the default parameter type with value articles-list.

Before when I was calling \Drupal::service('plugin.manager.menu.link')->loadLinksByRoute('news_list'), without any second second parameter (route params), it was returning me the menu links, but with the change in 9.5.9, I'm enforced to call \Drupal::service('plugin.manager.menu.link')->loadLinksByRoute('news_list', ['type' => 'news-list').

For me this broke many small things, like breadcrumbs, custom menu blocks, etc.

Steps to reproduce

1. Log in as admin.
2. Navigate to /admin/structure/views/add.
3. Add a view with options:
   • View name: Site content
   • Create a page: checked
   • Create a menu link: checked
   • Menu: Main navigation
4. Navigate to /site-content.
5. Inspect "Site content" main navigation item with browser tools and confirm class primary-nav__menu-link--active-trailis not present on a element.
6. Revert changes from #3277784: copyRawVariables should support default route parameters (or just comment out core/lib/Drupal/Core/Routing/Enhancer/ParamConversionEnhancer.php#L71-75).
7. Rebuild caches.
8. Navigate to /site-content.
9. Inspect "Site content" main navigation item with browser tools and confirm class primary-nav__menu-link--active-trailis present on a element.

Proposed resolution

In MenuTreeStorage::loadByRoute() also query without any default route parameters as they may not be present in the computed route_param_key.

Remaining tasks

Address @todo in MenuAccessTest::testSystemAdminMenuBlockAccessCheck() referencing this issue.