Closes #1653 Allow specifying the organization in content roles

[smeeus]

Organization can be specified for items in content variable arrays. The variable foreman_organization is the default value for backward compatibility.

[JaketheZ]

Closes #1653

[smeeus]

I've pulled in some of @JaketheZ 's commits from #1815 .
I have not included the manifest related changes for a couple of reasons; the biggest reason being that changing the way the foreman_manifest variable works, changing it from a plain dict to an array of dicts will most likely cause backward compatibility issues at some point.

[smeeus]

@evgeni Any additional thoughts and comments on the changes proposed in this PR?

PS: This is the PR mentioned at CfgMgmt Camp 2025 regarding multiple organizations for content roles.