Migrate all services to examples.yaml

[timotheeguerin]

Part of #4831.

RFC: https://github.com/Azure/azure-rest-api-specs/blob/rfc/unified-examples-format/documentation/rfc/unified-examples-format.md

Roll the examples migration out across all remaining services after the EventGrid pilot (#4838) proves the flow.

Scope

• Run examples-migrate (examples-migrate tool #4833) for every service to produce examples.yaml (dedup into since variants, {api-version} normalization).
• Validate each with examples-validate (examples.yaml JSON Schema + examples-validate #4832) and confirm per-version round-trip against the original x-ms-examples.
• Stage the migration service-by-service (or in batches) to keep PRs reviewable.
• Enforce in CI that new/updated examples use the new format once a service is migrated.
• Track and remediate services that need manual attention (unusual x-ms-examples, non-ARM URL shapes, etc.).

Out of scope

• Removing the legacy x-ms-examples JSON files (final cleanup once all consumers, incl. TCGC TCGC + consumers adoption #4836, are on the new format).

Depends on #4838 (EventGrid pilot + CI round-trip).