Reintroduce v5.6 Lifecycle and BATS jobs as preconditions for promote-candidate.
Reintroduce v5.6 Lifecycle and BATS jobs as preconditions for promote-candidate.

This was temporarily suspended as the v5.6 environment had stability issues.

[#101247750](https://www.pivotaltracker.com/story/show/101247750)

Signed-off-by: Caleb Miles <906dbe5b21c7025e252f807d6724eb4d0fd7fb4c@pivotal.io>

wcamarao/bosh-vcloud-cpi-release,cloudfoundry-incubator/bosh-vcloud-cpi-release,cloudfoundry-incubator/bosh-vcloud-cpi-release,wcamarao/bosh-vcloud-cpi-release,cloudfoundry-incubator/bosh-vcloud-cpi-release,wcamarao/bosh-vcloud-cpi-release