Packaging and configurability for the container monitor script

[natefoo]

Add the container monitor script to the galaxy-job-execution package so that it can be installed standalone. This is useful if you are running GxITs via Pulsar. First implemented in #9349 but not really usable in production when Galaxy is not accessible at the same path on the Pulsar server.

You can configure the command to run with the container_monitor_command param on destinations.

How to test the changes?

(Select all options that apply)

• [ ] I've included appropriate automated tests.
• [ ] This is a refactoring of components with existing test coverage.
• [ ] Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• [x] I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.