Refactor deployment configurations as separate subcommands

.gitlab/ci/test-on-cng/main.gitlab-ci.yml

gems/gitlab-cng/lib/gitlab/cng/commands/create.rb

...lab-cng/lib/gitlab/cng/commands/subcommands/deployment.rb

...cng/lib/gitlab/cng/lib/deployment/configurations/_base.rb

...-cng/lib/gitlab/cng/lib/deployment/configurations/kind.rb

...itlab-cng/lib/gitlab/cng/lib/deployment/default_values.rb

.../gitlab-cng/lib/gitlab/cng/lib/deployment/installation.rb

gems/gitlab-cng/lib/gitlab/cng/lib/kind/cluster.rb

gems/gitlab-cng/lib/gitlab/cng/lib/kind/configs.rb

gems/gitlab-cng/spec/integration/gitlab/cng/cli_spec.rb

gems/gitlab-cng/spec/unit/gitlab/cng/commands/create_spec.rb

...c/unit/gitlab/cng/commands/subcommands/deployment_spec.rb

...ec/unit/gitlab/cng/deployment/configurations/base_spec.rb

...ec/unit/gitlab/cng/deployment/configurations/kind_spec.rb

...-cng/spec/unit/gitlab/cng/deployment/installation_spec.rb

gems/gitlab-cng/spec/unit/gitlab/cng/kind/cluster_spec.rb

scripts/qa/cng_deploy/cng-kind.sh