Delete all x-ms-examples JSON files

**Target: January 2027**

Part of #4831.

RFC: https://github.com/Azure/azure-rest-api-specs/blob/rfc/unified-examples-format/documentation/rfc/unified-examples-format.md (§9 Phase 4)

**Delete all legacy `x-ms-examples` JSON files** from the repo — the new `examples.yaml` becomes the sole source of truth, with JSON generated on demand if still needed.

### Scope
- Remove the per-version `examples/*.json` files across all services.
- Confirm no remaining consumer reads the JSON files directly (all joined via `x-id`).

Depends on #4840 (old example tooling disabled).

Read RFC §9 Phase 4 and review #4840 to confirm the old example tooling is disabled. Inventory per-version examples/*.json files and check consumers that join through x-id rather than reading JSON directly. Done means the legacy JSON files are removed across services with no remaining direct consumers.

Written by the indexing model from the issue text.