This adds compatibility in `fleetctl preview` to work with docker compose (version 2). Since this version was released this April, we are still keeping backwards compatibility and using docker-compose as a fallback.
As v2 is now the recommended version and v1 is deprecated, this also rewords all prompts and help messages to say "docker compose".
Rel: #5746
* Start a fleetctl preview test
* Add tests for fleetctl preview
* Fix setting of fleetctl auth token in test
* Add fleet instance vulnerabilities config to response of GetAppConfig
* Add checks that fleetctl preview enables vulnerability detection
* Adjust doc for get config API response
* Add the include-server-config flag to fleetctl get config
* Update test now that some of the PRs have been merged
Co-authored-by: Tomas Touceda <chiiph@gmail.com>
