🐛 Remove omitempty from score fields on generated models.

[spencerschrock]

Fixes ossf/scorecard#2432

Specifies x-omitempty: false for score fields inopenapi.yaml. I ran make swagger after for the auto-generated files. Note for Makefile.swagger, the differences are deduplication of / in the paths. e.g:
app/generated/models//scorecard_version.go is now app/generated/models/scorecard_version.go

I tested locally with https://github.com/fsouza/fake-gcs-server and curl and it seems to have fixed the issue:

curl -X 'GET'   'http://127.0.0.1:38239/projects/github.com/numpy/numpy'   -H 'accept: application/json' | jq
...
{
      "name": "Signed-Releases",
      "score": 0,
      "reason": "0 out of 5 artifacts are signed or have provenance",
...

I see notes on the README that a new tag is required, as well as some manual deployment commands since openapi.yaml was modified. Beyond that, I'm unfamiliar with the webapp deployment process, so some handholding would be wise.

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[naveensrinivasan]

Thanks