[Monitor] Re-enable Autoscale recorded tests

[tjprescott]

These were converted to LiveScenarioTests in the Autoscale PR because the CI kept failing on them.

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[promptws]

View a preview at https://prompt.ws/r/Azure/azure-cli/5762
This is an experimental preview for @microsoft users.

[tjprescott]

The reason most of these tests failed was:

1. defaulting logic for admin-username fails on CI (because default there is root). That's why it always passes locally.
2. Test infrastructure is swallowing the actual error and just tossing out an incredibly unhelpful "AssertionError: the command failed"