chore: add permissions on endpointslice to Prometheus Role and use serviceDiscoveryRole: EndpointSlice in ServiceMonitors

[machine424]

• serviceDiscoveryRole is only available on recent p-o/OCP stacks... latest OLM could be deployed on old OCP versions?

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: machine424
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[openshift-ci]

@machine424: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify-commits	8c69f1e	link	true	/test verify-commits

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