config/prow: shrink gke-project-pool
config/prow: shrink gke-project-pool

This pool is almost entirely unused. Shrink it significantly by removing
projects matching patterns:

- gke-up-*
- k8s-gke-*
- kube-gke-upg-*
- k8s-jkns-e2e-gke-*
- k8s-jkns-e2e-gci-gke-*

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