Add integration tests for `docker_container_copy_out`

[AndrewJDawes]

Add integration tests for the docker_container_copy_out module from the existing feature/docker_container_copy_out branch.

As a way to get started:

• [x] Read the Ansible doc page on Understanding integration tests
• [x] Read this Medium article on Run “ansible-test” Locally, On Docker, and Over SSH
• [ ] Consider starting by duplicating the existing integration tests for the docker_container_copy_into module at tests/integration/targets/docker_container_copy_into (will need to adjust these tests make sense given that this module is the exact opposite of the new docker_container_copy_out module
• [ ] Choose a method for running the tests (more below)

Note: You probably don't need to worry about having ALL integration tests in the repo pass - only the new tests that you create. Some of the other tests may not pass locally - that's OK, we'll check them against a specialized environment using GitHub actions after you push your changes up. ansible-test integration does let you pass the name of a specific test to run. It will expect the name of the folder your test/role lives in - so it should be: ansible-test integration docker_container_copy_out.

There are some other methods mentioned in the Medium article (Locally, SSH) - but you may find it easiest to run the tests using Docker containers as supported by ansible-test.

If you want to do that, I would probably recommend:

• [x] Set up a Virtual Machine running Linux (I would recommend Ubuntu)
• [ ] Install the Docker daemon on the VM
• [ ] Install Ansible on the VM (make sure ansible-test is installed)
• [ ] Clone this repository onto the VM
• [ ] Run ansible-test integration --docker from the project's folder

Please let me know if you have any questions!

[AndrewJDawes]

@logansauers - let me know if you have any questions on this! I would be happy to help (though, I am not an expert on this either so I will probably be learning with you!).