fix: share call order with stub instances

[wangxpych]

Fixes #2760.

Problem

The per-sandbox callId context added for parallel-test isolation is passed through spy(), stub(), and fake(), but createStubInstance() still creates its method stubs with the module-level default context. Comparisons against other fakes from the same sandbox can therefore report the wrong call order.

Changes

• Thread the sandbox context through createStubInstance() when its methods are stubbed.
• Route the root sinon.createStubInstance() wrapper through its backing root sandbox so it uses the same context as root spies and stubs.
• Add regression coverage for both the root API and explicit sandboxes, placing a stub-instance call between two spy calls.

Verification

• npm test — Node: 1,558 passing / 12 pending; headless browser: 1,551 passing / 13 pending; WebWorker: 1 passing
• npm run lint
• npm run prettier:check
• npm run test-contract
• npm run check-dependencies

[wangxpych]

Withdrawing this contribution after re-evaluating the repository's recent human review and merge activity. No action is needed from maintainers. Thank you.