remove unused RekorVersion API definition

[bobcallaway]

The Rekor version endpoint was removed in #1022 but failed to remove the definition in openapi.yaml; this removes it and deletes the dead code generated for it.

Signed-off-by: Bob Callaway bcallaway@google.com

[codecov-commenter]

Codecov Report

Merging #1101 (f2b77e4) into main (a47adc1) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1101      +/-   ##
==========================================
- Coverage   63.73%   63.68%   -0.06%     
==========================================
  Files          82       82              
  Lines        7567     7567              
==========================================
- Hits         4823     4819       -4     
- Misses       2119     2121       +2     
- Partials      625      627       +2     

Flag	Coverage Δ
e2etests	48.43% <ø> (ø)
unittests	40.75% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/types/alpine/v0.0.1/entry.go	71.13% <0.00%> (-2.44%)	⬇️
pkg/types/helm/v0.0.1/entry.go	47.47% <0.00%> (ø)
pkg/types/rekord/v0.0.1/entry.go	68.42% <0.00%> (+0.65%)	⬆️

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