[CI] check links to resources in OTel org repos

[chalin]

Originally posted by @svrnm in https://github.com/open-telemetry/opentelemetry.io/pull/3772#discussion_r1483444122

... @chalin if that file gets moved, are we getting informed about that with a 404? I don't think that we are doing that right now.

Right, we are not. Let's use this issue to track the additional checking.