NETOBSERV-1578 subnets labels

[jpinsonneau]

Description

Get subnets from flows:

oc netobserv flows --get-subnets

Will need #105 to add the columns in a followup

Dependencies

Based on #121

Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.00%. Comparing base (6de3cd0) to head (800de31).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   26.00%   26.00%           
=======================================
  Files           8        8           
  Lines        1315     1315           
=======================================
  Hits          342      342           
  Misses        952      952           
  Partials       21       21           

Flag	Coverage Δ
unittests	26.00% <ø> (ø)

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[jotak]

code lgtm (not tested)

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New changes are detected. LGTM label has been removed.

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New changes are detected. LGTM label has been removed.

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