Always decorate k8s_owner_name

[mariomac]

The non-standard k8s_owner_name attribute was used in case a given metric had an onwner of an unknown kind.

Following what already do for network metrics, k8s_owner_name will hold the name of the owner even if it is known and already reported in either the k8s_deployment_name, k8s_statefulset_name, k8s_daemonset_name or k8s_replicaset_name.

This would simplify querying and should not have impact in metrics cardinality.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.68%. Comparing base (86c0519) to head (32900fd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1226      +/-   ##
==========================================
- Coverage   81.75%   81.68%   -0.07%     
==========================================
  Files         137      137              
  Lines       11483    11484       +1     
==========================================
- Hits         9388     9381       -7     
- Misses       1558     1563       +5     
- Partials      537      540       +3     

Flag	Coverage Δ
integration-test	60.37% <0.00%> (-0.39%)	:arrow_down:
k8s-integration-test	58.18% <100.00%> (-0.11%)	:arrow_down:
oats-test	36.07% <0.00%> (-0.01%)	:arrow_down:
unittests	53.03% <100.00%> (-0.02%)	:arrow_down:

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