Add Windows image field to Admin VM template

[jonnyry]

Add OS image field to Admin VM template in alignment with Guacamole VMs, to allow for easier OS image customisation.

[github-actions]

Unit Test Results

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Results for commit 7e88b6e.

♻️ This comment has been updated with latest results.

[jonnyry]

/test 9a798fa

[github-actions]

🤖 pr-bot 🤖

🏃 Running tests: https://github.com/microsoft/AzureTRE/actions/runs/12815913528 (with refid 5470df0d)

(in response to this comment from @jonnyry)

[jonnyry]

/test 9a798fa

[github-actions]

🤖 pr-bot 🤖

🏃 Running tests: https://github.com/microsoft/AzureTRE/actions/runs/12819486131 (with refid 5470df0d)

(in response to this comment from @jonnyry)

[tamirkamara]

Is this really needed @jonnyry ?

[jonnyry]

Is this really needed @jonnyry ?

It is useful for us to align our Windows images to a single base image. However if there's not value to the wider user base I'm happy to close.

(I realise that we could just override the image details directly in the terraform, however this aligns the mechanism with that used in the Guacamole VMs and makes it simpler to maintain.)