🌱 Add negative profile lookup test case

[tmshort]

This restores the negative test that was removed in #2632

Description

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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Pull request overview

This PR restores a negative test case for TLS profile lookup that was removed in PR #2632. The test verifies that looking up a non-existent profile returns an error, complementing the existing positive test cases in TestProfilesMapCompleteness.

Changes:

• Add a negative test case in TestProfilesMapCompleteness to verify that looking up a non-existent profile returns an error

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.95%. Comparing base (8614e3b) to head (e904867).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2633      +/-   ##
==========================================
+ Coverage   68.93%   68.95%   +0.02%     
==========================================
  Files         139      139              
  Lines        9891     9891              
==========================================
+ Hits         6818     6820       +2     
+ Misses       2563     2562       -1     
+ Partials      510      509       -1     

Flag	Coverage Δ
e2e	37.57% <ø> (+0.28%)	⬆️
experimental-e2e	52.25% <ø> (+0.04%)	⬆️
unit	53.60% <ø> (ø)

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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