Observability-operator dependency fix

[vyzigold]

There was an issue, when the telemetry-operator was trying to own a MonitoringStack even if the observability-operator wasn't installed and because of that there was no MonitoringStack CRD. This pull request adds a check if the MonitoringStack CRD exists before trying to own it.

[openshift-ci]

Hi @vyzigold. Thanks for your PR.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jlarriba, vyzigold

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