add retired VM size SKU block feature

[paxue]

add retired VM size SKU block feature
also support blocked_vm_sizes in yaml

[Copilot]

Pull request overview

Adds an Azure VM-size blocking mechanism to prevent deployments on Azure-retired SKUs and to support an additional user-configurable blocked_vm_sizes list in the runbook.

Changes:

• Introduces a hardcoded RETIRED_VM_SIZES blocklist for known retired Azure VM sizes.
• Extends AzurePlatformSchema with blocked_vm_sizes to allow runbook-based blocking.
• Filters blocked/retired sizes during capability discovery and raises on explicitly requested blocked sizes.

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[Copilot]

Pull request overview

Adds Azure VM size blocking to prevent deployments using retired SKUs and allow additional user-configured blocked sizes via the Azure platform runbook. This fits into LISA’s Azure platform capability selection flow by filtering disallowed sizes before capability/quota evaluation.

Changes:

• Introduces a hardcoded RETIRED_VM_SIZES block list for known retired Azure SKUs.
• Adds blocked_vm_sizes to AzurePlatformSchema to support YAML-configured blocking.
• Filters retired/blocked VM sizes during _get_allowed_capabilities, with a hard error when an explicit vm_size request is fully blocked.

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[Copilot]

Pull request overview

Adds an Azure VM-size blocking mechanism to prevent deployments on Azure-retired SKUs and to support user-configured blocked SKUs via runbook YAML, improving reliability of environment provisioning.

Changes:

• Introduces a hardcoded RETIRED_VM_SIZES denylist for Azure-retired VM SKUs.
• Adds blocked_vm_sizes to AzurePlatformSchema to allow runbook-configured VM-size blocking.
• Filters allowed VM sizes during capability selection and skips when an explicitly requested VM size is blocked/retired.

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[Copilot]

@paxue I've opened a new pull request, #4344, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

Pull request overview

Adds an Azure VM-size blocking mechanism so LISA won’t attempt deployments using Azure-retired SKUs, and also allows runbook-driven blocking of additional VM sizes.

Changes:

• Introduces a hardcoded RETIRED_VM_SIZES denylist for known retired Azure VM sizes.
• Extends AzurePlatformSchema to accept blocked_vm_sizes from YAML.
• Filters allowed_vm_sizes during capability discovery to exclude retired/blocked sizes and skip deployments when a user-requested size is blocked.

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