Fix rekor-cli backwards incompatibility & run harness tests against HEAD

[priyawadhwa]

also updates rekor-cli to iterate through all supported versions

[codecov-commenter]

Codecov Report

Merging #1030 (a8bff99) into main (a6e58f7) will decrease coverage by 0.27%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1030      +/-   ##
==========================================
- Coverage   41.34%   41.07%   -0.28%     
==========================================
  Files          70       70              
  Lines        6994     7040      +46     
==========================================
  Hits         2892     2892              
- Misses       3797     3843      +46     
  Partials      305      305              

Impacted Files	Coverage Δ
cmd/rekor-cli/app/upload.go	2.65% <0.00%> (-0.38%)	⬇️
pkg/types/entries.go	5.08% <ø> (ø)
pkg/types/intoto/intoto.go	15.87% <0.00%> (-16.39%)	⬇️
pkg/types/tuf/v0.0.1/entry.go	42.04% <0.00%> (ø)

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[priyawadhwa]

Couple updates:

1. Harness tests are currently failing because server @ HEAD returns an EntryID but rekor-cli get v0.10.0/v0.11.0 return a UUID. With Create EntryID for new artifacts and return EntryID to user #623 already merged it's a breaking change and users will need to update to rekor-cli v0.12.0 for rekor-cli get to work.
2. I couldn't get the iterator to work but I can give it another go tomorrow