add application/x-sigstore-tle as response type

[bobcallaway]

Fixes: #2218

[codecov]

Codecov Report

Attention: Patch coverage is 16.14907% with 135 lines in your changes missing coverage. Please review.

Project coverage is 41.76%. Comparing base (488eb97) to head (535289d).
Report is 224 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/tle/tle.go	0.00%	114 Missing ⚠️
pkg/generated/client/entries/entries_client.go	0.00%	11 Missing ⚠️
...g/generated/restapi/operations/rekor_server_api.go	0.00%	8 Missing ⚠️
pkg/generated/restapi/configure_rekor_server.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2262       +/-   ##
===========================================
- Coverage   66.46%   41.76%   -24.70%     
===========================================
  Files          92      192      +100     
  Lines        9258    24835    +15577     
===========================================
+ Hits         6153    10372     +4219     
- Misses       2359    13693    +11334     
- Partials      746      770       +24     

Flag	Coverage Δ
e2etests	?
unittests	41.76% <16.14%> (-5.93%)	⬇️

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[bobcallaway]

after reviewing, there's a problem in that we cannot take a TLE and convert back into a models.LogEntry because we don't have the tree ID to correctly set the entryUUID. While most tests still pass, others expect the full entryUUID and therefore I think this will significantly break clients. Given the flaky nature of go-openapi's Accept header support, and this fact, I think we'll have to punt this to the v2 api.