Add namespace label to align with Pod Security Admission requirements

[bpradipt]

Fixes: #KATA-1583

- Description of the problem which is fixed/What is the use case
OpenShift 4.11 is going to enable pod security admission (https://kubernetes.io/docs/concepts/security/pod-security-admission/) using the “restricted” profile by default (https://kubernetes.io/docs/concepts/security/pod-security-standards/)
Since we require privileged support for kata-monitor, we need to label the namespace accordingly

- What I did
Added required labels to the openshift-sandboxed-containers-operator ns

- How to verify it
Create a Kata Pod and check controller logs for pod-security.kubernetes.io/audit-violations.
There shouldn't be any audit-violations when kata-monitor pods gets created

- Description for the changelog

Add namespace label to align with Pod Security Admission requirements

[openshift-ci]

@bpradipt: all tests passed!

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