[Matthew Christopher (matthchr)]

This fixes the longstanding bug Azure/azure-sdk-for-go#23342

[Xu Xue (xuexu6666)]

Code review

No issues found. Checked for bugs, Go idioms, prior-PR feedback, and code-comment/generated-file invariants.

Notes:

• Import swaps are complete (grep -r armcompute/v8 is empty); go build/go vet/go test pass on the branch.
• Test_SKU_UnmarshalZoneDetails correctly exercises the fix: it feeds the uppercase "Name" zoneDetails key from azure-sdk-for-go#23342 and asserts it now decodes via IsUltraSSDAvailableInAvailabilityZone.
• v2/hack/generate_vmsize_testdata.go output is SDK-version-independent, so leaving v2/testdata unregenerated is correct.
• Expect the usual Copilot nit on the go 1.25.0 patch directive in v2/go.mod — it's intentional (propagated from the azcore/armcompute deps) and was already resolved on bump armcompute v7 -> v8 in skewer/v2 #36.