Improvements to working with Business Units in the GraphQL API

Quote Requests, Staged Quotes, and Quotes now support Reference Expansion on Business Unit in the GraphQL API.

Changes:

• [GraphQL API] Changed the StagedQuote type:
  • Added the businessUnitRef field to the StagedQuote type.
  • StagedQuote.businessUnit field type changed from KeyReference to BusinessUnit
• [GraphQL API] Changed the Quote type:
  • Added the businessUnitRef field to the Quote type.
  • Quote.businessUnit field type changed from KeyReference to BusinessUnit
• [GraphQL API] Changed the QuoteRequest type:
  • Added the businessUnitRef field to the QuoteRequest type.
  • QuoteRequest.businessUnit field type changed from KeyReference to BusinessUnit

The following changes were introduced in terms of GraphQL SDL:

extend type StagedQuote {
  businessUnitRef: KeyReference
}
extend type Quote {
  businessUnitRef: KeyReference
}
extend type QuoteRequest {
  businessUnitRef: KeyReference
}