DRAFT - feat: Limit cache to watch only relevant objects

[akrejcir]

WORK IN PROGRESS

What this PR does / why we need it:
Currently the cache watches all objects of specific types in all namespaces. This adds unnecessary memory load to the operator. The allocated memory scales with objects in the cluster that are not related to the operator, for example deployments created by users.

This PR limits which objects the cache watches.

Which issue(s) this PR fixes:
Jira: https://issues.redhat.com/browse/CNV-41247
Jira: https://issues.redhat.com/browse/CNV-38130

Release note:

None

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarcloud]

Quality Gate passed

Issues
10 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[kubevirt-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[kubevirt-bot]

PR needs rebase.

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