fix(metric): Add VFP counter metric for uninitialized object

[BeegiiK]

Description

Add node level metric for no VFPCounters. Tested the new metric works by calling the metrics endpoint inside the node of the windows retina pod:

curl.exe http://10.224.0.9:10093/metrics  

...

networkobservability_windows_hns_stats{direction="win_packets_recv_count"} 1
networkobservability_windows_hns_stats{direction="win_packets_sent_count"} 86
# HELP networkobservability_windows_vfp_stats Include many different metrics from packets sent/received to closed connections
# TYPE networkobservability_windows_vfp_stats counter
networkobservability_windows_vfp_stats{state="uninitialized"} 20

Related Issue

#933

Checklist

• I have read the contributing documentation.
• I signed and signed-off the commits (git commit -S -s ...). See this documentation on signing commits.
• I have correctly attributed the author(s) of the code.
• I have tested the changes locally.
• I have followed the project's style guidelines.
• I have updated the documentation, if necessary.
• I have added tests, if applicable.

Screenshots (if applicable) or Testing Completed

Please add any relevant screenshots or GIFs to showcase the changes made.

Additional Notes

The metric was generated as it brought outside the conditional statement for testing purposes only, i.e. metric can be compiled and incremented.

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