Description of problem:
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The fix for the bug 2091976 was not backported to CNV v4.12.z. This is required for CNV v4.12.z

Version-Release number of selected component (if applicable):
-------------------------------------------------------------
CNV 4.12.3

How reproducible:
-----------------
Always

Steps to Reproduce:
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1. Create a VM with memory.request as 1Gi and memory.limits as 2Gi
2. Run stress-ng inside the VM, to make use of 100% of memory

Actual results:
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Alert is thrown only when free memory goes below 20MB, which is very close to the VM getting evicted. It is because of the reason this limit is raised to 50MB

Expected results:
-----------------
Alert 'KubevirtVmHighMemoryUsage' should be triggered when the free memory of the VM goes below 50MB. The patch that addressed the issue for the bug 2091976 should also be backported to CNV v4.12