Deploy the Promotion BO API

What this does

Turns on the Consumer Goods Cloud TPM Promotion Business Object (BO) API in a Salesforce org, interviews the user for one custom Workflow Step to add to the promotion pipeline, generates and deploys that Apex class, registers it against a BO API entity, wires it into the customer's chosen subset of {create, update, copy} workflows, then proves the whole path end-to-end via three REST endpoints:

• POST /services/apexrest/<prefix>/promotions/initialize
• POST /services/apexrest/<prefix>/promotions/ingest
• GET /services/apexrest/<prefix>/promotions/status?importId=...