[Not against master] Temporarily comment out etcd integration package test usage

[andrewmains12]

I am currently working on replacing the etcd/integration package with a docker based approach (https://github.com/m3db/m3/pull/4141). Until that lands however, provide Uber with a branch that doesn't encounter the otel dependency conflicts introduced by the etcd/server package (imported by etcd/integration).

This diff does that through hackish means--we simply comment out usages. It will NOT be landed to master.