cleanup makefile with generated code; cleanup unused files

[bobcallaway]

(finally) Fixed the Makefile to only re-run swagger if there was a relevant change in its dependencies by using an included Makefile.swagger file.

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

[codecov-commenter]

Codecov Report

Merging #910 (095cbca) into main (ee3f127) will increase coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #910      +/-   ##
==========================================
+ Coverage   47.75%   48.05%   +0.29%     
==========================================
  Files          62       62              
  Lines        5461     5427      -34     
==========================================
  Hits         2608     2608              
+ Misses       2563     2529      -34     
  Partials      290      290              

Impacted Files	Coverage Δ
pkg/types/entries.go	6.25% <0.00%> (ø)
pkg/types/rekord/v0.0.1/entry.go	49.49% <0.00%> (+0.65%)	⬆️
pkg/types/tuf/v0.0.1/entry.go	42.38% <0.00%> (+0.68%)	⬆️
pkg/types/jar/v0.0.1/entry.go	39.40% <0.00%> (+0.76%)	⬆️
pkg/types/helm/v0.0.1/entry.go	48.91% <0.00%> (+0.83%)	⬆️
pkg/types/rpm/v0.0.1/entry.go	56.25% <0.00%> (+0.86%)	⬆️
pkg/types/alpine/v0.0.1/entry.go	54.20% <0.00%> (+0.89%)	⬆️
pkg/types/rfc3161/v0.0.1/entry.go	39.69% <0.00%> (+1.17%)	⬆️
pkg/pki/tuf/tuf.go	51.80% <0.00%> (+1.21%)	⬆️
pkg/types/hashedrekord/v0.0.1/entry.go	53.84% <0.00%> (+1.34%)	⬆️

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