New Backoffice: Health check controller refactor (#13763)

* Refactor AllHealthCheckGroupController to return just the names of the groups + changes in the HealthCheckFactory

* Introduce a new "get by name without results" endpoint

* Create a "check" endpoint

* View models changes

* Factory renaming changes

* Remove Task.FromResult

* Update OpenApi.json

* Minor updates

* Inject HealthCheckCollection directly into the factory

src/Umbraco.Cms.Api.Management/Controllers/HealthCheck/ExecuteActionHealthCheckController.cs

@@ -54,7 +54,7 @@ public class ExecuteActionHealthCheckController : HealthCheckControllerBase
                 Type = "Error",
             };
 
-            return await Task.FromResult(BadRequest(invalidModelProblem));
+            return BadRequest(invalidModelProblem);
         }
 
         HealthCheckStatus result = healthCheck.ExecuteAction(_umbracoMapper.Map<HealthCheckAction>(action)!);