feat(servicenow): replace adapter-based project with Integration Model CRUD workflows

[michaelelrom]

Summary

• Replaces the old 9-workflow native ServiceNow adapter Studio Project with 48 CRUD workflows across 8 folders, backed by the ServiceNow Change Management:latest and ServiceNow Table API:latest Integration Models (both previously reviewed as already scoped for automation, so no operation trimming was needed).
• Adds conventional camelCase operationIds to servicenow_table_api-latest.json and servicenow_itential_services_app-latest.json, which were missing them upstream — the dated -v2.json originals are left untouched.
• Itential Services App (1 relay operation) is intentionally excluded from the Studio Project — it's a relay endpoint for a specific integration pattern, not a general-purpose CRUD resource.
• Rewrites ServiceNow/README.md to document the Integration Model-only configuration and the new folder structure, dropping the legacy adapter instructions.

Test plan

• All 48 workflows created and schema-validated against a running Itential Platform instance
• List Change Requests and List Table Records executed against a real ServiceNow instance and confirmed returning live data
• Remaining workflows not individually executed