Always install the RedHat elasticsearch-operator in openshift-operators-redhat

[simu]

The operator doesn't cleanly support installation in a different namespace, since it hardcodes the metrics service name in the servicemonitor which it creates to contain namespace name openshift-operators-redhat.

Fixes #5

Checklist

• [x] The PR has a meaningful title. It will be used to auto generate the changelog. The PR has a meaningful description that sums up the change. It will be linked in the changelog.
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• [x] Update the documentation.
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[simu]

We'll need a follow-up to regenerate the package golden tests once this PR is merged.