feat: [DTOSS-11830] Update the Live AVD host pool with new image

[MacMur85]

Description

Update the VM image used for the Live AVD Host pool. Green AVD becomes the default one.
Chore update: fix to the AVD docs.

Context

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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