provider: prevent fatal log when no operatorGroups

[sebrandon1]

In the provider.go, we have:

env.OperatorGroups, err = GetAllOperatorGroups()
if err != nil {
   log.Fatal("Cannot get OperatorGroups: %v", err)
}

Where if we fail to do a lookup for the OperatorGroups, we are issuing a log.Fatal which then crashes the execution. In my opinion we should handle this gracefully if its a basic Not Found error.

This is an example of running against a cluster without any OperatorGroups without this change:

bpalm at bpalm-mac in ~/Repositories/go/src/github.com/redhat-best-practices-for-k8s/certsuite on main [?$]
$ ./certsuite run -l accesscontrol

FATAL: Cannot get OperatorGroups: the server could not find the requested resource (get operatorgroups.operators.coreos.com)

[dcibot]

from change #2672:

• SUCCESS https://www.distributed-ci.io/jobs/0af0a681-846b-4bc5-a046-c1863c159746/jobStates

[dcibot]

from change #2672:

• SUCCESS https://www.distributed-ci.io/jobs/9679a4e4-ca1b-4f31-ba05-17a6fdab97ac/jobStates

[dcibot]

from change #2672:

• SUCCESS https://www.distributed-ci.io/jobs/1e58d117-d43b-4ae0-8062-cadd4763c4ab/jobStates