Slurm config editor preparation

[jamesbeedy]

Description

Provide a description of the purpose of this pull request, as well as its
motivation and context. Is it a new feature? A bug fix? Does it address an existing issue?

How was the code tested?

Describe the conditions under which the code has been tested.

• Did you run the defined integration and units under tests/?
• Did you write new tests? Where are they located in the repository?
• Which undercloud did you use to perform the tests? LXD, vSphere, AWS, etc.
• What operating system did you test the charms on? Ubuntu 22.04, Ubuntu 20.04, CentOS 7, etc.

Related issues and/or tasks

Link any related issues or project board tasks to this pull request.

Checklist

• I am the author of these changes, or I have the rights to submit them.
• I have added the relevant changes to the README and/or documentation.
• I have self reviewed my own code.
• All requested changes and/or review comments have been resolved.