Virtual Machines: Includes Ubuntu 24.04 LTS images.

[ninjarobot]

This PR closes #

The changes in this PR are as follows:

• Virtual Machines: Includes Ubuntu 24.04 LTS images.

I have read the contributing guidelines and have completed the following:

• Tested my code end-to-end against a live Azure subscription.
• Updated the documentation in the docs folder for the affected changes.
• Written unit tests against the modified code that I have made.
• Updated the release notes with a new entry for this PR.
• Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

If I haven't completed any of the tasks above, I include the reasons why here:

Adding convenience function for Ubuntu 24.04 images. The image definitions are not listed in docs and unit tests aren't intended to cover every image.

Below is a minimal example configuration that includes the new features, which can be used to deploy to Azure:

vm {
    name "ubuntu2404-arm"
    username "azureuser"
    vm_size Standard_D2ps_v5
    operating_system UbuntuServer_2404LTSArm
    os_disk 128 StandardSSD_LRS
    no_data_disk
    diagnostics_support
    system_identity
}

[ninjarobot]

Going to go ahead and merge this so I can include in the release.