remove Beyla k8s cache image build from release-1.8 branch

[mariomac]

No description provided.

[grcevski]

LGTM! Thank you Mario!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.09%. Comparing base (9791155) to head (05ffe55).
Report is 1 commits behind head on release-1.8.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.8    #1375      +/-   ##
===============================================
+ Coverage        81.07%   81.09%   +0.01%     
===============================================
  Files              140      140              
  Lines            14068    14068              
===============================================
+ Hits             11406    11408       +2     
+ Misses            2141     2140       -1     
+ Partials           521      520       -1     

Flag	Coverage Δ
integration-test	57.12% <ø> (+0.07%)	⬆️
k8s-integration-test	57.94% <ø> (-0.23%)	⬇️
oats-test	36.27% <ø> (ø)
unittests	52.08% <ø> (-0.02%)	⬇️

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