[Release 1.28] Add script to validate flannel versions

[manuelbuil]

Backport: #5788

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.46%. Comparing base (eaf2a2c) to head (bf9248d).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.28    #5896   +/-   ##
=============================================
  Coverage         26.46%   26.46%           
=============================================
  Files                30       30           
  Lines              2649     2649           
=============================================
  Hits                701      701           
  Misses             1903     1903           
  Partials             45       45           

Flag	Coverage Δ
inttests	10.00% <ø> (ø)
unittests	18.80% <ø> (ø)

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