Respect do-not-merge/contains-merge-commits label
Respect do-not-merge/contains-merge-commits label

This label is set by the mergecommitblocker plugin, currently enabled
for:

- kubernetes/kubernetes
- kubernetes/release
- kubernetes/sig-release

But tide wasn't setup to block merges on the presence of this label.

Have tide respect it in the query for all kubernetes orgs, and the
query for k/k

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