Retrieve one check in a specific group with group settings applied (V2)

Show details of one check in a specific check group with the group settings applied.

Unlike /v1, this endpoint does not return the flat project, logicalId, member and pending fields. A check can be managed by more than one project and each of those fields can name only one of them; projectBindings reports every binding, and is identical on /v1 and /v2.

Versioning is per endpoint. Only endpoints whose response or payload changed have a /v2; everything else remains on /v1 and is unaffected. In particular the check groups themselves, and creating, updating and deleting checks, are unchanged and stay on /v1.