[release-v0.19] fix: Remove namespaceSelector from webhook definition

[akrejcir]

This is a backport of: https://github.com/kubevirt/ssp-operator/pull/879

What this PR does / why we need it: The ValidatingWebhookConfiguration created by OLM can have namespaceSelector field set. We don't want it, because the webhook checks that there is only one SSP resource in the cluster.

Which issue(s) this PR fixes: Jira: https://issues.redhat.com/browse/CNV-36636

Release note:

None

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
3 Security Hotspots
C Security Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[akrejcir]

Waiting for QE to confirm that we want this.

/hold

[akrejcir]

QE wants this backport.

/unhold

[akrejcir]

/cc @ksimon1 @jcanocan

[jcanocan]

/lgtm