Increase test suite around deploy tokens behavior

app/helpers/deploy_tokens_helper.rb

app/models/deploy_token.rb

app/models/project_deploy_token.rb

...ervices/auth/container_registry_authentication_service.rb

app/views/projects/deploy_tokens/_form.html.haml

doc/user/project/deploy_tokens/index.md

lib/gitlab/auth.rb

spec/controllers/projects/deploy_tokens_controller_spec.rb

...ntrollers/projects/settings/repository_controller_spec.rb

spec/lib/gitlab/auth_spec.rb

spec/lib/gitlab/git_access_spec.rb

spec/lib/gitlab/import_export/all_models.yml

spec/models/deploy_token_spec.rb

spec/policies/deploy_token_policy_spec.rb

...senters/projects/settings/deploy_tokens_presenter_spec.rb

...es/auth/container_registry_authentication_service_spec.rb

spec/services/deploy_tokens/create_service_spec.rb