[Az.Compute] Add AvailabilityPolicy support for Managed Disks

[aimuhire]

Description

Exposes Azure SDK's existing Disk Availability Policy feature through PowerShell cmdlets, enabling configuration of VM behavior when disks experience I/O degradation.

New Parameter:

• -ActionOnDiskDelay parameter added to New-AzDiskConfig and New-AzDiskUpdateConfig
• Supported values: None, AutomaticReattach

Cmdlets Updated:

• New-AzDiskConfig
• New-AzDiskUpdateConfig

Usage

# Create disk with automatic reattachment on I/O issues
$config = New-AzDiskConfig -Location "EastUS" -DiskSizeGB 5 `
    -SkuName Standard_LRS -CreateOption Empty `
    -ActionOnDiskDelay 'AutomaticReattach'
New-AzDisk -ResourceGroupName "rg" -DiskName "disk" -Disk $config

# Update existing disk policy
$update = New-AzDiskUpdateConfig -ActionOnDiskDelay 'None'
Update-AzDisk -ResourceGroupName "rg" -DiskName "disk" -Disk $update

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request