[Release 1.29] Add script to validate flannel versions

[manuelbuil]

Backport: #5788

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-1.29@949ab45). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-1.29    #5898   +/-   ##
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  Coverage                ?   26.46%           
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  Files                   ?       30           
  Lines                   ?     2649           
  Branches                ?        0           
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  Hits                    ?      701           
  Misses                  ?     1903           
  Partials                ?       45           

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

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