Stop bundling ginkgo into this image

[whi-tw]

Rather than supplying the baked-in ginkgo command, instead just provide a decent golang / cf-cli install, as we now run ginkgo via go run, to avoid version mismatches.

paas-docker-cloudfoundry-tools/cf-acceptance-tests/Dockerfile

Line 29 in 1b0fef4

RUN go install github.com/onsi/ginkgo/v2/ginkgo@latest

see:

• Run tests with go run rather than with ginkgo paas-cf#3003
• Run ginkgo better for paas-billing and paas-metrics paas-cf#2998