Fix the setup-robot flow for non default ns.
Fix the setup-robot flow for non default ns.

We only need the quick return if the robot exists and has a valid cert. In
any other case create new certs and return them.

Also remove a left over TODO.

Change-Id: I32933df48a3f1500a0645981803da18b10b150b4
GitOrigin-RevId: dbfb4306ce8aba650b6fd6fcb39578971e509a90

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core