Remove some early optimization at webhook and really directly on reflect.DeepEquals

[qinqon]

What happened:
At the webhook there are some flags/checks around to not impact too much api operations over VirtualMachines, but that may be an early optimization, we can just remove those and depends on new old pod DeepEquals.

What you expected to happen:
A clear and concise description of what you expected to happen.

How to reproduce it (as minimally and precisely as possible):
Steps to reproduce the behavior.

Additional context:
Add any other context about the problem here.

Environment:

• KubeVirt version (use virtctl version): N/A
• Kubernetes version (use kubectl version): N/A
• VM or VMI specifications: N/A
• Cloud provider or hardware configuration: N/A
• OS (e.g. from /etc/os-release): N/A
• Kernel (e.g. uname -a): N/A
• Install tools: N/A
• Others: N/A

[kubevirt-bot]

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Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[kubevirt-bot]

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Mark the issue as fresh with /remove-lifecycle rotten.
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/lifecycle rotten