docs/windows/policy: update ADMX/ADML policy definitions to include the new Always On setting

This adds a new policy definition for the AlwaysOn.Enabled policy setting
as well as the AlwaysOn.OverrideWithReason sub-option.

Updates #14823
Updates tailscale/corp#26247

Signed-off-by: Nick Khyl <nickk@tailscale.com>
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