NETOBSERV-1908 Be able to customize namespace

[jpinsonneau]

Description

Allow custom namespace using NETOBSERV_NAMESPACE env variable.

Example:

$ NETOBSERV_NAMESPACE=test ./build/oc-netobserv flows

Dependencies

Based on #102

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 labelled 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

Attention: Patch coverage is 2.98507% with 65 lines in your changes missing coverage. Please review.

Project coverage is 25.11%. Comparing base (6ff0e29) to head (e98fbe6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/root.go	2.56%	38 Missing ⚠️
cmd/flow_capture.go	5.00%	19 Missing ⚠️
cmd/packet_capture.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   25.08%   25.11%   +0.02%     
==========================================
  Files           8        8              
  Lines        1148     1362     +214     
==========================================
+ Hits          288      342      +54     
- Misses        839      999     +160     
  Partials       21       21              

Flag	Coverage Δ
unittests	25.11% <2.98%> (+0.02%)	⬆️

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

Files with missing lines	Coverage Δ
cmd/packet_capture.go	0.00% <0.00%> (ø)
cmd/flow_capture.go	33.09% <5.00%> (+1.35%)	⬆️
cmd/root.go	27.47% <2.56%> (-20.15%)	⬇️

... and 5 files with indirect coverage changes