Add test covering use of viper with unmarshaller

[jotak]

Description

Dependencies

n/a

Checklist

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• Will this change affect NetObserv / Network Observability operator? If not, you can ignore the rest of this checklist.
• 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).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.16%. Comparing base (24bf8ce) to head (d5b0210).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #623      +/-   ##
==========================================
- Coverage   67.22%   67.16%   -0.06%     
==========================================
  Files         104      104              
  Lines        7459     7459              
==========================================
- Hits         5014     5010       -4     
- Misses       2143     2145       +2     
- Partials      302      304       +2     

Flag	Coverage Δ
unittests	67.16% <ø> (-0.06%)	⬇️

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[jotak]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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