Update image used

[mbiver]

Platform image 20h1-ent is no longer present, so will want to update or it will fail. Also, as we now default to generation 2, will want to make sure the image is g2 or it will also fail. win10-21h2-ent-g2 works for now.

[prmerger-automator]

@mbiver : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

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[mbiver]

If we update the image to Gen 2, since that the new default, we'll also need to update the VM size, as the current size "Standard_D2_v2" doesn't support Gen 2 VM's. Below should fix the template.

((Get-Content -path $templateFilePath -Raw) -replace 'Standard_D2_v2','Standard_D2_v4') | Set-Content -Path $templateFilePath

[mbiver]

Will also need to update this section then:

VM size: For Windows, use Standard_D2_v2 or greater. The default size is Standard_D1_v2, which isn't suitable for Windows.

[v-dirichards]

@kof-f

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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