False positive for config validation

[nicolastakashi]

Looks like it's missing some env vars and is reflecting as invalid config, seems to me a false positive.

Config available here

[marcelbirkner]

Link to k8sobjectsreceiver source code / config:

https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/receiver/k8sobjectsreceiver#kubernetes-objects-receiver

[mmanciop]

I think is something that we can tackle only after #180