Revert: reducing scope of informer

[mariomac]

Reverts this PR #1210

We did the wrong assumption that global entities were only required for Network Metrics. But service graph metrics also require being decorated from cluster-wide pods.

Since we are working on a definitive solution based on external informers caches, I'm just reverting this change to avoid bugs and simplifying the code.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.95%. Comparing base (8c3c9db) to head (27ca29f).

Files with missing lines	Patch %	Lines
pkg/internal/kube/informer_provider.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1245      +/-   ##
==========================================
+ Coverage   81.89%   81.95%   +0.05%     
==========================================
  Files         137      137              
  Lines       11489    11470      -19     
==========================================
- Hits         9409     9400       -9     
+ Misses       1544     1541       -3     
+ Partials      536      529       -7     

Flag	Coverage Δ
integration-test	60.98% <50.00%> (-0.04%)	⬇️
k8s-integration-test	58.80% <90.00%> (+0.30%)	⬆️
oats-test	36.47% <50.00%> (+0.04%)	⬆️
unittests	53.16% <90.00%> (+0.04%)	⬆️

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[marctc]

But service graph metrics also require being decorated from cluster-wide pods.

Oh shoot! Agree on having one solution for this problem.

[grcevski]

LGTM!