Code cleanup / refactoring to minimize dependencies in api

[jotak]

Description

The api package should keep minimal dependencies, as it is typically the kind of package that other integrating tools may want to import

The dependency on
github.com/netobserv/network-observability-operator/internal/pkg/cluster was problematic as it pulls a lot transitively, including kube clients. So it's removed, and cluster.Info is replaced in the webhook with an interface clusterInfo.

Dependencies

n/a

Checklist

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• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
  • If so, make sure the JIRA epic is labeled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
  • If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • Standard QE validation, with pre-merge tests unless stated otherwise.
  • Regression tests only (e.g. refactoring with no user-facing change).
  • No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

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[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.64%. Comparing base (e3056de) to head (8c82162).

Files with missing lines	Patch %	Lines
...lector/v1beta2/flowcollector_validation_webhook.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2498      +/-   ##
==========================================
- Coverage   72.71%   72.64%   -0.08%     
==========================================
  Files         104      104              
  Lines       10615    10615              
==========================================
- Hits         7719     7711       -8     
- Misses       2425     2428       +3     
- Partials      471      476       +5     

Flag	Coverage Δ
unittests	72.64% <92.30%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/controller/networkpolicy/np_objects.go	96.57% <100.00%> (ø)
internal/pkg/cluster/cluster.go	84.37% <100.00%> (-1.79%)	⬇️
...lector/v1beta2/flowcollector_validation_webhook.go	73.70% <50.00%> (ø)

... and 4 files with indirect coverage changes

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[OlivierCazade]

LGTM