[Release 1.27] Add an integration test for flannel-backend=none

[manuelbuil]

Backport: #9582

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.78%. Comparing base (06d6bc8) to head (7fae9a9).

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.27    #9609       +/-   ##
=================================================
- Coverage         47.71%   26.78%   -20.93%     
=================================================
  Files               154      154               
  Lines             16565    16565               
=================================================
- Hits               7904     4437     -3467     
- Misses             7367    11340     +3973     
+ Partials           1294      788      -506     

Flag	Coverage Δ
e2etests	?
inttests	21.34% <ø> (-16.15%)	⬇️
unittests	15.29% <ø> (ø)

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