[release-1.10] NETOBSERV-2438: fix issues when filtering on subnet labels

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1118

/assign jotak

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: NETOBSERV-2438

In response to this:

This is an automated cherry-pick of #1118

/assign jotak

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[openshift-ci]

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[openshift-ci]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.70%. Comparing base (63a2d75) to head (3744837).

❗ There is a different number of reports uploaded between BASE (63a2d75) and HEAD (3744837). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (63a2d75)	HEAD (3744837)
uitests	1	0

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #1123      +/-   ##
================================================
- Coverage         53.75%   47.70%   -6.06%     
================================================
  Files               205       40     -165     
  Lines             10444     2805    -7639     
  Branches           1295        0    -1295     
================================================
- Hits               5614     1338    -4276     
+ Misses             4318     1298    -3020     
+ Partials            512      169     -343     

Flag	Coverage Δ
uitests	?
unittests	47.70% <ø> (ø)

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[jotak]

the bug fixed here was introduced by #1048 which isn't in 1.10, so cancelling the backport here