bump armcompute v7 -> v8 in skewer/v2

[xuexu6666]

What

Migrate the v2 module (github.com/Azure/skewer/v2) from azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v7 to armcompute/v8 (v8.1.0).

Why

Consumers (e.g. AKS RP) are moving to armcompute/v8. Because skewer.SKU is type SKU armcompute.ResourceSKU, a consumer on v8 cannot convert its armcompute.ResourceSKU to skewer's v7-pinned SKU. skewer needs a v8 release to unblock them.

Changes

• v2/: rewrite armcompute/v7 -> armcompute/v8 imports across source, tests, example, and hack generator.
• v2/go.mod: require armcompute/v8 v8.1.0; go mod tidy also moves azcore 1.19.1 -> 1.22.0.
• v2/README.md: update doc example import.

Pure import-path bump — no API changes. ResourceSKU and the client types are identical between v7 and v8 (v8's only breaking change was Cloud Services (classic) removal, which skewer does not use).

Validation

• go build ./... ✅
• go test ./... ✅ (all v2 tests pass)

Suggest releasing as v2.1.0 (minor; no API change).

[Copilot]

Pull request overview

Migrate the github.com/Azure/skewer/v2 module from azure-sdk-for-go armcompute/v7 to armcompute/v8 so downstream consumers on v8 can interoperate with skewer.SKU (which aliases armcompute.ResourceSKU).

Changes:

• Update all armcompute imports in v2 source, tests, example code, and the hack generator from /v7 to /v8.
• Bump v2 module dependencies to armcompute/v8 v8.1.0 (and related Azure SDK transitive updates via go mod tidy).
• Refresh documentation snippet imports and module sums for the v2 module.

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
v2/wrap.go	Switch armcompute import to /v8.
v2/sku.go	Switch armcompute import to /v8.
v2/sku_test.go	Switch armcompute import to /v8.
v2/README.md	Update example import to /v8.
v2/interface.go	Switch armcompute import to /v8.
v2/hack/generate_vmsize_testdata.go	Switch armcompute import to /v8 in generator.
v2/go.sum	Update sums after dependency bumps/tidy.
v2/go.mod	Require armcompute/v8 v8.1.0 and update Azure SDK versions.
v2/fakes_test.go	Switch armcompute import to /v8.
v2/example/example.go	Switch armcompute import to /v8.
v2/disk_test.go	Switch armcompute import to /v8.
v2/data_test.go	Switch armcompute import to /v8.
v2/clients.go	Switch armcompute import to /v8.
v2/cache_test.go	Switch armcompute import to /v8.

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