JSON API Resource Config defines a canonical link template but does not have a canonical route

Problem/Motivation

The JSON API Resource Config entity type defines a canonical link template in the entity type annotation:

/**
 * Defines the JSON API Resource Config entity.
 * 
 * ....
 *   links = {
 *     "canonical" = "/admin/config/services/jsonapi/{jsonapi_resource_config}",
 *     "add-form" = "/admin/config/services/jsonapi/add/{entity_type_id}/{bundle}",
 *     "edit-form" = "/admin/config/services/jsonapi/{jsonapi_resource_config}/edit",
 *     "delete-form" = "/admin/config/services/jsonapi/{jsonapi_resource_config}/delete",
 *     "collection" = "/admin/config/services/jsonapi"
 *   }
 * )
 */
class JsonapiResourceConfig extends ConfigEntityBase {

The associated route is added conditionally by Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider::getRoutes:

    if ($canonical_route = $this->getCanonicalRoute($entity_type)) {
      $collection->add("entity.{$entity_type_id}.canonical", $canonical_route);
    }

However, the entity type does not list a view_builder handler, so the DefaultHtmlRouteProvider does not generate a route for the entity type:

  protected function getCanonicalRoute(EntityTypeInterface $entity_type) {
    if ($entity_type->hasLinkTemplate('canonical') && $entity_type->hasViewBuilderClass()) {
    }
  }

Proposed resolution

Considering there is no real use case for a canonical page for the JSON API Resource Config entity type, remove the canonical link template from the JSON API Resource Config entity type annotation.

Remaining tasks

1. Write a patch
2. Review
3. Commit

User interface changes

None.

API changes

None.

Data model changes

The JSON API Resource Config entity type no longer defines a canonical link template.