[RULE] Check for new VM SKU available for upgrade

[Leandroesc]

Existing rule

No response

Suggested rule

New VM SKU helps with better hardware, performance, security and reliability in most cases. Having PSRule checking for VMs that have new GA SKU available can help customers identify candidates that can be upgraded

Pillar

Operational Excellence

Additional context

https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/retirement-overview

[BernieWhite]

We should split this rule out into four Azure.VM.SKUCapacityLimited, Azure.VM.SKUPreviousGen, Azure.VMSS.SKUCapacityLimited, Azure.VMSS.SKUPreviousGen:

Capacity limited

Capacity limited is reliability pillar since you may not be able to allocate a VM or VMSS instance at any time.
This rule should flag any VM SKUs that use the capacity limited:

• https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/previous-gen-sizes-list marked as next gen available.

Previous gen

Previous gen is performance efficiency since newer SKUs perform better for most scenarios due to increases limits for disk/ networking and better hardware.

• https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/previous-gen-sizes-list marked as next gen available.