Net O11y K8s cluster name retrieval

[mariomac]

It also adds a network flow printer node, for simpler debug and troubleshooting.

Manually testing:

• EKS
• Azure
• GCE

[grcevski]

LGTM! This looks good to me. One thing that I think we need to do is add the inclusion of the DataDog agent apache - 2 license in NOTICE, just like we do for the other products where we've taken code from.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 27.41117% with 143 lines in your changes are missing coverage. Please review.

Project coverage is 77.78%. Comparing base (d3dc33f) to head (951b41a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/internal/netolly/transform/k8s/clustername.go	0.00%	121 Missing ⚠️
pkg/internal/netolly/transform/k8s/kubernetes.go	50.00%	16 Missing ⚠️
pkg/internal/netolly/export/printer.go	83.33%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #648      +/-   ##
==========================================
- Coverage   79.11%   77.78%   -1.33%     
==========================================
  Files          91       93       +2     
  Lines        7575     7766     +191     
==========================================
+ Hits         5993     6041      +48     
- Misses       1255     1394     +139     
- Partials      327      331       +4     

Flag	Coverage Δ
integration-test	68.84% <27.41%> (-1.09%)	⬇️
unittests	40.28% <0.50%> (-0.95%)	⬇️

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