Remove RedHat images

[dmjb]

We no longer need these - use the ko images instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.34%. Comparing base (dc32844) to head (0b33b6a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3502      +/-   ##
==========================================
+ Coverage   65.27%   65.34%   +0.07%     
==========================================
  Files         399      399              
  Lines       38990    38990              
==========================================
+ Hits        25449    25477      +28     
+ Misses      11569    11545      -24     
+ Partials     1972     1968       -4     

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