chore: add nvme disk controller type for gen2 images

[anujmaheshwari1]

What type of PR is this? This PR does some ugly but required refactoring to ensure all new Gen2 Image definitions created are tagged with DiskControllerType=NVMe

Gen1/Arm64/CVM do not need that tag, only Gen2 does.

Successful VHD build with new AzLinux v3 SKUs: https://msazure.visualstudio.com/CloudNativeCompute/_build/results?buildId=103962751&view=results

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• [ ] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[coveralls]

Pull Request Test Coverage Report for Build 11004612753

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 71.271%

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Totals
Change from base Build 11004311485:	0.0%
Covered Lines:	2590
Relevant Lines:	3634

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💛 - Coveralls