feat: Add build support for GB200/300 image series

[keith-ms]

This change pulls in the commits specific to the release-gb200 branch into main rather than trying to merge commit from main into release-gb200.

I've modified the vhdbuilder/packer/pre-install-dependencies.sh from the release-gb200 branch so that the NVIDIA kernel path from the PPA depends on the presence of the GB200 feature flag.

[github-actions]

PR Title Lint Failed ❌

Current Title: feat: Add build support for GB200/300 image series

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