Remove cf-release pipeline.
Remove cf-release pipeline.

- it has been moved to github.com/cloudfoundry/runtime-ci

[#114234003]

Signed-off-by: Rob Dimsdale <4df639ba78cac7f8d741d02ef508f2611d6911dd@pivotal.io>

cloudfoundry/mega-ci,cloudfoundry/mega-ci