[windows-2025, ubuntu-24.04] Change to Generation 2 VM

[shamil-mubarakshin]

Description

This PR changes windows-2025 and ubuntu-24.04 to produce Generation 2 VMs

Related issue:

Check list

• Related issue / work item is attached
• Tests are written (if applicable)
• Documentation is updated (if applicable)
• Changes are tested and related VM images are successfully generated

[Copilot]

Pull request overview

This PR updates the Azure Marketplace SKU references for Windows Server 2025 and Ubuntu 24.04 to use Generation 2 VM images instead of Generation 1. For Windows 2025, the SKU changes from 2025-Datacenter to 2025-Datacenter-g2, explicitly specifying Gen2. For Ubuntu 24.04, the SKU changes from server-gen1 to server, which is the canonical default Generation 2 SKU for Ubuntu 24.04 LTS.

Changes:

• Updated Windows Server 2025 to use the -g2 SKU suffix for Generation 2 VM support
• Updated Ubuntu 24.04 to use the default server SKU (Generation 2) instead of server-gen1

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
images/windows/templates/locals.windows.pkr.hcl	Changed Windows 2025 marketplace SKU to use Generation 2 variant with -g2 suffix
images/ubuntu/templates/locals.ubuntu.pkr.hcl	Changed Ubuntu 24.04 marketplace SKU from server-gen1 to server for Generation 2 support

[Copilot]

The Ubuntu 24.04 SKU naming convention differs from Ubuntu 22.04. Ubuntu 22.04 uses the format 'canonical:0001-com-ubuntu-server-jammy:22_04-lts-gen2' with an explicit '-gen2' suffix, while Ubuntu 24.04 uses 'canonical:ubuntu-24_04-lts:server'. Consider adding a comment explaining that 'server' is the Generation 2 variant for Ubuntu 24.04 to maintain consistency with the explicit Gen2 naming used for Ubuntu 22.04 and to clarify the PR's intent.

Suggested change

	"ubuntu24" = {
	"ubuntu24" = {
	// For Ubuntu 24.04, the 'server' SKU corresponds to the Generation 2 image (analogous to the '-gen2' suffix used for Ubuntu 22.04).