Add an integration test suite for k/release
Add an integration test suite for k/release

This commit creates an integration test suite for k/release. Running the
full go test suite in one single job requires too much time, sig-release
is in the effort of splitting it

cjwagner/test-infra,dims/test-infra,fejta/test-infra,michelle192837/test-infra,dims/test-infra,monopole/test-infra,kubernetes/test-infra,cjwagner/test-infra,jessfraz/test-infra,dims/test-infra,fejta/test-infra,kubernetes/test-infra,cblecker/test-infra,jessfraz/test-infra,cjwagner/test-infra,cblecker/test-infra,brahmaroutu/test-infra,monopole/test-infra,fejta/test-infra,monopole/test-infra,monopole/test-infra,pwittrock/test-infra,jessfraz/test-infra,jessfraz/test-infra,jessfraz/test-infra,brahmaroutu/test-infra,dims/test-infra,cblecker/test-infra,brahmaroutu/test-infra,michelle192837/test-infra,cblecker/test-infra,jessfraz/test-infra,pwittrock/test-infra,pwittrock/test-infra,BenTheElder/test-infra,dims/test-infra,michelle192837/test-infra,michelle192837/test-infra,cjwagner/test-infra,cblecker/test-infra,BenTheElder/test-infra,brahmaroutu/test-infra,brahmaroutu/test-infra,monopole/test-infra,kubernetes/test-infra,kubernetes/test-infra,cblecker/test-infra,kubernetes/test-infra,BenTheElder/test-infra,pwittrock/test-infra,kubernetes/test-infra,cjwagner/test-infra,pwittrock/test-infra,fejta/test-infra,BenTheElder/test-infra,dims/test-infra,michelle192837/test-infra,fejta/test-infra,BenTheElder/test-infra,BenTheElder/test-infra,michelle192837/test-infra,brahmaroutu/test-infra,monopole/test-infra,fejta/test-infra,cjwagner/test-infra