* feat(api/stacks): use compose-unpacker to deploy stacks from git
* refactor(api/stacks): move stack operation as unpacker builder parameter + check builder func existence
* fix(api/stacks): defer removal of unpacker container after error check
* refactor(api/unpacker-builder): clearer code around client creation for standalone and swarm manager
* refactor(api/stacks): extract git stack check to utility function
* fix(api/stacks): apply skip tls when deploying with unpcker - ref EE-5023
* fix(api/stacks): defer close of docker client
cmeng